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

$\huge\sf{Answer:-}$

Given question

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

Using formula

= x 2 −y 2

= ( x + y ) ( x − y )

hence,

= ( 22 ) 2 − ( 21 ) 2

= ( 22 + 21 ) ( 22 − 21 )

= 43 × 1

= 43