Cube Root of 121

The cube root of 121 is 4.94608744325. The cube root of 121 is expressed as ∛121 in radical form, where the “ ∛ “ sign” is called the “radical” sign. In exponential form, it is written as (121)^1/3. If “m” is the cube root of 121, then, m³=121. Let us find the value of “m”.
 

We can find cube root of 121 through a method, named as, Halley’s Method. Let us see how it finds the result.
 

Now, what is Halley’s Method? It is an iterative method for finding cube roots of a given number N, such that, x³=N, where this method approximates the value of “x”.

Formula is ∛a≅ x((x³+2a) / (2x³+a)), where 

a=given number whose cube root you are going to find

x=integer guess for the cubic root

Let us apply Halley’s method on the given number 121.

Step 1: Let a=121. Let us take x as 4, since 4³=64 is the nearest perfect cube which is less than 121.

Step 2: Apply the formula.  ∛121≅ 4((4³+2×121) / (2(4)³+121))= 4.92

Hence, 4.92 is the approximate cubic root of 121.
 

• Integers - Integers can be a positive natural number, negative of a positive number, or zero. We can perform all the arithmetic operations on integers. The examples of integers are, 1, 2, 5,8, -8, -12, etc.

• Whole numbers - The whole numbers are part of the number system, which includes all the positive integers from 0 to infinity. 

• Square root -The square root of a number is a value “y” such that when “y” is multiplied by itself → y × y, the result is the original number.

• Polynomial - It is an algebraic expression made up of variables like “x” and constants, combined using addition, subtraction, multiplication, or division, where the variables are raised to whole number exponents.

• Approximation - Finding out a value which is nearly correct, but not perfectly correct.

• Iterative method - This method is a mathematical process which uses an initial value to generate further and step-by-step sequence of solutions for a problem.