# ROOTS OF INTEGERS

Roots of integers :

To find roots of integers, first we have to notice the index of the given root. According to the index of the given radical, we have to split the number and simplify.

## What is index of the root ?

We have to read the first term as cube root of 27 and second term as 5th root of 125.

## How to find roots of integers

Step 1 :

Let "x" be the root of the given radical term

Step 2 :

According to the index, we have to raise power on both sides.For example, if we have square root, then we have to take squares on both sides, in order to remove the square root.

Step 3 :

After cancelling the power and the radical sign in right hand side, we have to express the number in the exponential form.

Step 4 :

Check whether we have same powers on either sides of equal sign.

Step 5 :

Since the power are equal, we can decide that bases are also equal.

From the above steps, we can find the roots of the integers.

Let us look into some examples based on the above concept.

Example 1 :

Find the real number root of √64

Solution :

Step 1 :

Index of the given square root  =  2

Let "x" be the required root

x  =  √64

Step 2 :

In order to remove the square root, take squares on both sides

x²  =  (√64)²

x²  =  64

Step 3 :

Express 64 as the product of two same numbers

That is, 64 =  8 x 8

64  =  8²

x²  =  8²

Step 4 :

Since the powers are equal, then their base are also equal.

x  =  8

Hence the required root is 8.

Example 2 :

Find the real number root of ∛512

Solution :

Step 1 :

Index of the given square root  =  3

Let "x" be the required root

x  =  ∛512

Step 2 :

In order to remove the square root, raise power 3 on both sides

x³  =  (∛512)³

x³  =  512

Step 3 :

Express 512 as the product of two same numbers

That is, 512 =  8 x 8 x 8

512  =  8³

x³  =  8³

Step 4 :

Since the powers are equal, then their base are also equal.

x  =  8

Hence the required root is 8.

Example 3 :

Find the real number root of ∛-8000

Solution :

Step 1 :

Index of the given square root  =  3

Let "x" be the required root

x  =  ∛-8000

Step 2 :

In order to remove the square root, raise power 3 on both sides

x³  =  (∛-8000)³

x³  =  -8000

Step 3 :

Express -8000 as the product of two same numbers

That is, -8000 =  (-20) x (-20) x (-20)

-8000  =  (-20)³

x³  =  (-20)³

Step 4 :

Since the powers are equal, then their base are also equal.

x  =  -20

Hence the required root is -20.

Example 4 :

Find the real number root of ∜16

Solution :

Step 1 :

Index of the given square root  =  4

Let "x" be the required root

x  =  ∜16

Step 2 :

In order to remove the square root, raise power 3 on both sides

x  =  (∜16)

x  =  16

Step 3 :

Express 16 as the product of two same numbers

That is, 16 =  2 x 2 x 2 x 2

16  =  2

x  =  2

Step 4 :

Since the powers are equal, then their base are also equal.

x  =  2

Hence the required root is 2.

After having gone through the stuff given above, we hope that the students would have understood "Roots of integers".

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