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

Explanation:

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.

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