Cube Root of 9

The cube root of 9 is 2.08008382305. The cube root of 9 is expressed as ∛9 in radical form, where the “∛"  sign is called the “radical” sign. In exponential form, it is written as (9)^⅓. If “m” is the cube root of 9, then, m³=9. Let us find the value of “m”.

The Prime Factorization of 9 is 3×3, so, the cube root of 9 is expressed as ∛9 as its simplest radical form. We can find the cube root of 9 through another 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 9.

Step 1: Let a=9. Let us take x as 2, since, 2³=8 is the nearest perfect cube which is less than 9.

Step 2: Apply the formula.  ∛9≅ 2((2³+2×9) / (2(2)³+9)) = 2.08

Hence, 2.08 is the approximate cubic root of 9.
 

• 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.