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 21 without actually calculating the squares.

Using the formula

${x}^{2} - {y}^{2} = (x + y)(x - y) \\ </p><p>We \: get....$

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

Answer 2

Step-by-step explanation:

Given,

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

By using the formula

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

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