Question

Subtract the square of 21 from the square of 22 without actually calculating the squares. ​

Answer 1

Answer:

Given,

We need to Subtract the square of 21 from the square of 22 without actually calculating the squares.

Using the formula

${x}^{2} - {y}^{2} = (x + y)(x - y)$

We get....

$= > {(22)}^{2} - {(21)}^{2} \\ = > (22 + 21)(22 - 21) \\ = > 43 \times 1 \\ = > 43.$

Answer 2

SOLUTION:-

Given:

•Subtract the square of 21 from the square of 22 without actually calculating the squares

Explanation:

We have,

$= > ({22})^{2} - ( {21})^{2}$

Here, make a formula of the a² - b²

We know that, a² -b²= (a+b)(a-b)

Therefore,

$= > (22 + 21)(22 - 21) \\ \\ = > (43 )(1) \\ \\ = > 43 \times 1 \\ \\ = > 43$

Thus,

The number is 43.

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