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Last updated on May 26th, 2025

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Square Root of -1/2

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If a number is multiplied by the same number, the result is a square. The inverse of the square is a square root. The square root is used in fields like vehicle design and finance. Here, we will discuss the square root of -1/2.

Square Root of -1/2 for Thai Students
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What is the Square Root of -1/2?

The square root is the inverse of the square of a number. The number -1/2 is not a positive number, and its square root is complex. The square root of -1/2 is expressed in both radical and exponential form. In radical form, it is expressed as √(-1/2), whereas (-1/2)^(1/2) is the exponential form. The square root of -1/2 can be written as (i/√2), which is a complex number because it involves the imaginary unit i, where i = √(-1).

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Finding the Square Root of -1/2

Finding the square root of negative numbers involves using the imaginary unit. Since -1/2 is not a positive number, typical real-number methods like prime factorization or long division are not applicable. Instead, we use complex number techniques. 1. Use the property of square roots of negative numbers: √(-a) = i√a. 2. Express -1/2 as a product of -1 and 1/2. 3. Apply the property: √(-1/2) = √(-1) * √(1/2) = i * (√1/√2) = (i/√2).

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Square Root of -1/2 by Complex Number Method

To find the square root of -1/2 using complex numbers, we use the imaginary unit i, where i = √(-1).

 

Step 1: Express -1/2 as (-1) * (1/2).

Step 2: Use the property of square roots: √(-1/2) = √(-1) * √(1/2).

Step 3: Simplify using the imaginary unit: √(-1) = i, so √(-1/2) = i * √(1/2).

Step 4: Further simplify: √(1/2) = 1/√2, so the result is (i/√2).

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Square Root of -1/2 by Polar Form

Another way to find the square root of a complex number is using its polar form.

 

Step 1: Express -1/2 in polar form as r(cos θ + i sin θ), where r is the modulus and θ is the argument.

 

Step 2: For -1/2, r = 1/2 and θ = π (since it lies on the negative real axis).

 

Step 3: Apply the square root formula for polar forms: √r (cos(θ/2) + i sin(θ/2)).

 

Step 4: √(1/2) = 1/√2, and θ/2 = π/2.

 

Step 5: Substitute these values to get (1/√2)(cos(π/2) + i sin(π/2)) = (i/√2).

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Common Mistakes and How to Avoid Them in the Square Root of -1/2

Students often make mistakes while dealing with complex square roots. Here are some common errors and how to avoid them:

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Common Mistakes and How to Avoid Them in the Square Root of -1/2

Students often make mistakes when finding square roots of negative numbers. Here are some common errors and how to avoid them.

Mistake 1

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Ignoring the Imaginary Unit

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It's crucial to remember that the square root of a negative number involves the imaginary unit i.

 

For instance, forgetting that √(-1) = i can lead to incorrect results.

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Square Root of -1/2 Examples

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Problem 1

Can you help Alex find the modulus of the complex number √(-1/2)?

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The modulus of the complex number is 1/√2.

Explanation

The modulus of a complex number a + bi is √(a² + b²). For √(-1/2) = (i/√2), the modulus is √(0² + (1/√2)²) = 1/√2.

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Problem 2

If the square root of -1/2 is expressed in polar form, what is the angle it makes with the positive real axis?

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The angle is π/2 radians.

Explanation

For -1/2, the original angle is π. Its square root in polar form is at angle π/2, since θ/2 = π/2.

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Problem 3

Calculate √(-1/2) multiplied by 2.

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The result is i√2.

Explanation

√(-1/2) = i/√2. When multiplied by 2, it becomes 2 * (i/√2) = i√2.

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Problem 4

How do you express the square root of -1/2 in terms of exponential form?

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It is expressed as (1/√2)eiπ/2.

Explanation

The exponential form is r * eiθ, where r = 1/√2 and θ = π/2, so it is (1/√2)eiπ/2.

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Problem 5

Find the square of the complex number (i/√2).

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The square is -1/2.

Explanation

(i/√2)² = (i²/2) = -1/2, since i² = -1.

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FAQ on Square Root of -1/2

1.What is √(-1/2) in exponential form?

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2.What are the real and imaginary parts of √(-1/2)?

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3.How does the square root of a negative number differ from a positive number?

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4.Is -1/2 a complex number?

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5.Can complex numbers be used in real-world applications?

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6.How does learning Algebra help students in Thailand make better decisions in daily life?

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7.How can cultural or local activities in Thailand support learning Algebra topics such as Square Root of -1/2?

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8.How do technology and digital tools in Thailand support learning Algebra and Square Root of -1/2?

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9.Does learning Algebra support future career opportunities for students in Thailand?

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Important Glossaries for the Square Root of -1/2

  • Complex Number: A number in the form a + bi, where a and b are real numbers and i is the imaginary unit.

 

  • Imaginary Unit: Denoted as i, it satisfies i² = -1.

 

  • Polar Form: Expresses a complex number in terms of modulus and angle, as r(cos θ + i sin θ).

 

  • Exponential Form: Represents a complex number using e as r * eiθ, where r is the modulus and θ is the argument.

 

  • Modulus: The magnitude of a complex number, calculated as √(a² + b²) for a number a + bi.
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About BrightChamps in Thailand

At BrightChamps, we understand algebra is more than just symbols—it opens up a world of opportunities! Our mission is to help children across Thailand develop essential math skills, focusing today on the Square Root of -1/2 with a special look at square roots—in a lively, enjoyable, and easy-to-follow manner. Whether your child is discovering the speed of a roller coaster at Dream World, tallying local football scores, or managing their allowance to buy the latest gadgets, mastering algebra gives them confidence for everyday life. Our interactive lessons make learning fun and straightforward. Since children in Thailand have varied learning styles, we personalize our approach for each child. From Bangkok’s busy streets to Phuket’s tropical islands, BrightChamps brings math to life, making it relatable and exciting throughout Thailand. Let’s make square roots a joyful part of every child’s math journey!
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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.

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Fun Fact

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

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