BrightChamps Logo
Login
Creative Math Ideas Image
Live Math Learners Count Icon103 Learners

Last updated on July 19th, 2025

Math Whiteboard Illustration

Derivative of 3 Square Root of x

Professor Greenline Explaining Math Concepts

We use the derivative of 3√x, which is (3/2)x^(-1/2), as a measuring tool for how the function changes in response to a slight change in x. Derivatives help us calculate profit or loss in real-life situations. We will now talk about the derivative of 3√x in detail.

Derivative of 3 Square Root of x for Australian Students
Professor Greenline from BrightChamps

What is the Derivative of 3 Square Root of x?

We now understand the derivative of 3√x. It is commonly represented as d/dx (3√x) or (3√x)', and its value is (3/2)x^(-1/2). The function 3√x has a clearly defined derivative, indicating it is differentiable within its domain. The key concepts are mentioned below: Square Root Function: (√x = x^(1/2)). Power Rule: Rule for differentiating x^(n) (since it involves powers of x). Constant Multiple Rule: When a constant multiplies a function, differentiate the function and multiply by the constant.

Professor Greenline from BrightChamps

Derivative of 3 Square Root of x Formula

The derivative of 3√x can be denoted as d/dx (3√x) or (3√x)'. The formula we use to differentiate 3√x is: d/dx (3√x) = (3/2)x^(-1/2) The formula applies to all x > 0.

Professor Greenline from BrightChamps

Proofs of the Derivative of 3 Square Root of x

We can derive the derivative of 3√x using proofs. To show this, we will use the power rule along with the rules of differentiation. There are several methods we use to prove this, such as: By First Principle Using Power Rule Using Constant Multiple Rule We will now demonstrate that the differentiation of 3√x results in (3/2)x^(-1/2) using the above-mentioned methods: By First Principle The derivative of 3√x can be proved using the First Principle, which expresses the derivative as the limit of the difference quotient. To find the derivative of 3√x using the first principle, we will consider f(x) = 3√x. Its derivative can be expressed as the following limit. f'(x) = limₕ→₀ [f(x + h) - f(x)] / h … (1) Given that f(x) = 3√x, we write f(x + h) = 3√(x + h). Substituting these into equation (1), f'(x) = limₕ→₀ [3√(x + h) - 3√x] / h = 3 limₕ→₀ [√(x + h) - √x] / h Multiply by the conjugate to simplify: = 3 limₕ→₀ [(x + h - x) / h(√(x + h) + √x)] = 3 limₕ→₀ h / [h(√(x + h) + √x)] = 3 limₕ→₀ 1 / (√(x + h) + √x) = 3/(2√x) As x approaches 0, the expression simplifies to (3/2)x^(-1/2). Using Power Rule To prove the differentiation of 3√x using the power rule, We use the formula: 3√x = 3x^(1/2) Using the power rule: d/dx [x^n] = n*x^(n-1) d/dx (3x^(1/2)) = 3 * (1/2) * x^(-1/2) = (3/2) * x^(-1/2) Using Constant Multiple Rule We will now prove the derivative of 3√x using the constant multiple rule. The step-by-step process is demonstrated below: Here, we use the formula, 3√x = 3 * x^(1/2) Using the constant multiple rule where d/dx [c*f(x)] = c*f'(x), d/dx (3√x) = 3 * d/dx (x^(1/2)) Using the power rule: d/dx (x^(1/2)) = (1/2) * x^(-1/2) So, d/dx (3√x) = 3 * (1/2) * x^(-1/2) = (3/2) * x^(-1/2)

Professor Greenline from BrightChamps

Higher-Order Derivatives of 3 Square Root of x

When a function is differentiated several times, the derivatives obtained are referred to as higher-order derivatives. Higher-order derivatives can be a little tricky. To understand them better, think of a car where the speed changes (first derivative) and the rate at which the speed changes (second derivative) also changes. Higher-order derivatives make it easier to understand functions like 3√x. For the first derivative of a function, we write f′(x), which indicates how the function changes or its slope at a certain point. The second derivative is derived from the first derivative, which is denoted using f′′(x). Similarly, the third derivative, f′′′(x), is the result of the second derivative, and this pattern continues. For the nth Derivative of 3√x, we generally use fⁿ(x) for the nth derivative of a function f(x) which tells us the change in the rate of change. (continuing for higher-order derivatives).

Professor Greenline from BrightChamps

Special Cases:

When x is 0, the derivative is undefined because the square root function is not defined for non-positive values of x. When x is 1, the derivative of 3√x = (3/2)x^(-1/2), which is 3/2.

Max Pointing Out Common Math Mistakes

Common Mistakes and How to Avoid Them in Derivatives of 3 Square Root of x

Students frequently make mistakes when differentiating 3√x. These mistakes can be resolved by understanding the proper solutions. Here are a few common mistakes and ways to solve them:

Mistake 1

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Not simplifying the equation

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

Students may forget to simplify the equation, which can lead to incomplete or incorrect results. They often skip steps and directly arrive at the result, especially when solving using the power or constant multiple rule. Ensure that each step is written in order. Students might think it is awkward, but it is important to avoid errors in the process.

Mistake 2

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Forgetting the Undefined Points of 3√x

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

They might not remember that 3√x is undefined for x ≤ 0. Keep in mind that you should consider the domain of the function that you differentiate. It will help you understand that the function is not continuous at such certain points.

Mistake 3

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Incorrect use of Power Rule

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

While differentiating functions such as 3x^(1/2), students misapply the power rule. For example: Incorrect differentiation: d/dx (3x^(1/2)) = 3/2x^(1/2). The correct application is: d/dx (3x^(1/2)) = (3/2)x^(-1/2). To avoid this mistake, apply the power rule correctly by reducing the exponent by one.

Mistake 4

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Not writing Constants and Coefficients

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

There is a common mistake that students at times forget to multiply the constants placed before √x. For example, they incorrectly write d/dx (3√x) = 1/2x^(-1/2). Students should check the constants in the terms and ensure they are multiplied properly. For e.g., the correct equation is d/dx (3√x) = (3/2)x^(-1/2).

Mistake 5

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

Not Applying the Chain Rule

Green Checkmark Icon Indicating Correct Solutions in This Math Topic

Students often forget to use the chain rule when it is necessary. This happens when the derivative of an inner function is not considered. For example: Incorrect: d/dx (3√(2x)) = (3/2)(2x)^(-1/2). To fix this error, students should divide the functions into inner and outer parts. Then, make sure that each function is differentiated. For example, d/dx (3√(2x)) = 3 * (1/2)(2x)^(-1/2) * 2.

arrow-right
Max from BrightChamps Saying "Hey"

Examples Using the Derivative of 3 Square Root of x

Ray, the Character from BrightChamps Explaining Math Concepts
Max, the Girl Character from BrightChamps

Problem 1

Calculate the derivative of (3√x · x^3)

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

Here, we have f(x) = 3√x · x^3. Using the product rule, f'(x) = u′v + uv′ In the given equation, u = 3√x and v = x^3. Let’s differentiate each term, u′= d/dx (3√x) = (3/2)x^(-1/2) v′= d/dx (x^3) = 3x^2 substituting into the given equation, f'(x) = ((3/2)x^(-1/2))(x^3) + (3√x)(3x^2) Let’s simplify terms to get the final answer, f'(x) = (3/2)x^(5/2) + 9x^(5/2) Thus, the derivative of the specified function is (21/2)x^(5/2).

Explanation

We find the derivative of the given function by dividing the function into two parts. The first step is finding its derivative and then combining them using the product rule to get the final result.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 2

XYZ Construction is building a water tower, and the height of the water level is represented by the function y = 3√x where y represents the height of the water at time x. If x = 4 hours, measure the rate of change of the water level.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

We have y = 3√x (height of the water level)...(1) Now, we will differentiate the equation (1) Take the derivative of 3√x: dy/dx = (3/2)x^(-1/2) Given x = 4 (substitute this into the derivative) dy/dx = (3/2)(4)^(-1/2) dy/dx = (3/2)(1/2) dy/dx = 3/4 Hence, the rate of change of the water level at time x = 4 is 3/4.

Explanation

We find the rate of change of the water level at x = 4 as 3/4, which means that at a given point, the height of the water would increase at a rate of 3/4 per hour.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 3

Derive the second derivative of the function y = 3√x.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

The first step is to find the first derivative, dy/dx = (3/2)x^(-1/2)...(1) Now we will differentiate equation (1) to get the second derivative: d²y/dx² = d/dx [(3/2)x^(-1/2)] Here we use the power rule, d²y/dx² = (3/2)(-1/2)x^(-3/2) d²y/dx² = (-3/4)x^(-3/2) Therefore, the second derivative of the function y = 3√x is (-3/4)x^(-3/2).

Explanation

We use the step-by-step process, where we start with the first derivative. Using the power rule, we differentiate the expression. We then simplify the terms to find the final answer.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 4

Prove: d/dx ((3√x)^2) = 3√x/x.

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

Let’s start using the power rule: Consider y = (3√x)^2 = 9x To differentiate, we use the power rule: dy/dx = d/dx [9x] dy/dx = 9 Since the derivative of x^(1/2) is (1/2)x^(-1/2), d/dx ((3√x)^2) = 3√x/x Hence proved.

Explanation

In this step-by-step process, we used the power rule to differentiate the equation. Then, we replaced the expression with its derivative. As a final step, we substituted back to derive the equation.

Max from BrightChamps Praising Clear Math Explanations
Max, the Girl Character from BrightChamps

Problem 5

Solve: d/dx (3√x/x)

Ray, the Boy Character from BrightChamps Saying "Let’s Begin"

To differentiate the function, we use the quotient rule: d/dx (3√x/x) = (d/dx (3√x) * x - 3√x * d/dx(x))/x² We will substitute d/dx (3√x) = (3/2)x^(-1/2) and d/dx (x) = 1 = ((3/2)x^(-1/2) * x - 3√x * 1) / x² = ((3/2)x^(1/2) - 3√x) / x² = 0 Therefore, d/dx (3√x/x) = 0.

Explanation

In this process, we differentiate the given function using the product rule and quotient rule. As a final step, we simplify the equation to obtain the final result.

Max from BrightChamps Praising Clear Math Explanations
Ray Thinking Deeply About Math Problems

FAQs on the Derivative of 3 Square Root of x

1.Find the derivative of 3√x.

Math FAQ Answers Dropdown Arrow

2.Can we use the derivative of 3√x in real life?

Math FAQ Answers Dropdown Arrow

3.Is it possible to take the derivative of 3√x at the point where x = 0?

Math FAQ Answers Dropdown Arrow

4.What rule is used to differentiate 3√x/x?

Math FAQ Answers Dropdown Arrow

5.Are the derivatives of 3√x and 3√(x²) the same?

Math FAQ Answers Dropdown Arrow
Professor Greenline from BrightChamps

Important Glossaries for the Derivative of 3 Square Root of x

Derivative: The derivative of a function indicates how the given function changes in response to a slight change in x. Square Root Function: A function that involves the root of a number, typically represented as √x. Power Rule: A rule used to differentiate functions of the form x^n, where n is a constant. First Derivative: The initial result of a function, which gives us the rate of change of a specific function. Constant Multiple Rule: A rule stating that when a constant multiplies a function, the derivative is the constant multiplied by the derivative of the function.

Professor Greenline from BrightChamps

About BrightChamps inAustralia

At BrightCHAMPS, we believe algebra is more than symbols it opens doors to endless opportunities! Our mission is to help children all over Australia gain important math skills, focusing today on the Derivative of 3 Square Root of x with a special emphasis on understanding square roots in a lively, fun, and easy-to-grasp way. Whether your child is calculating the speed of a roller coaster at Luna Park Sydney, tracking cricket match scores, or managing their allowance for the newest gadgets, mastering algebra gives them the confidence to tackle everyday problems. Our interactive lessons make learning both simple and enjoyable. Since children in Australia learn in various ways, we adapt our approach to fit each learner’s style. From Sydney’s vibrant streets to the stunning Gold Coast beaches, BrightCHAMPS brings math to life, making it relevant and exciting throughout Australia. Let’s make square roots a joyful part of every child’s math journey!
Math Teacher Background Image
Math Teacher Image

Jaskaran Singh Saluja

About the Author

Jaskaran Singh Saluja is a math wizard with nearly three years of experience as a math teacher. His expertise is in algebra, so he can make algebra classes interesting by turning tricky equations into simple puzzles.

Max, the Girl Character from BrightChamps

Fun Fact

: He loves to play the quiz with kids through algebra to make kids love it.

INDONESIA - Axa Tower 45th floor, JL prof. Dr Satrio Kav. 18, Kel. Karet Kuningan, Kec. Setiabudi, Kota Adm. Jakarta Selatan, Prov. DKI Jakarta
INDIA - H.No. 8-2-699/1, SyNo. 346, Rd No. 12, Banjara Hills, Hyderabad, Telangana - 500034
SINGAPORE - 60 Paya Lebar Road #05-16, Paya Lebar Square, Singapore (409051)
USA - 251, Little Falls Drive, Wilmington, Delaware 19808
VIETNAM (Office 1) - Hung Vuong Building, 670 Ba Thang Hai, ward 14, district 10, Ho Chi Minh City
VIETNAM (Office 2) - 143 Nguyễn Thị Thập, Khu đô thị Him Lam, Quận 7, Thành phố Hồ Chí Minh 700000, Vietnam
Dubai - BrightChamps, 8W building 5th Floor, DAFZ, Dubai, United Arab Emirates
UK - Ground floor, Redwood House, Brotherswood Court, Almondsbury Business Park, Bristol, BS32 4QW, United Kingdom