Question

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

Answer 1

$\huge\sf{Answer:-}$

Given

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

Formula

x² - y² = ( x + y) ( x - y )

So,

= ( 22 )² - ( 21 )² ° ( 22 + 21 ) ( 22 - 21 )

= 41 × 1

= 43

Answer 2

Answer:

Given,

We need to Nearly any object, common ones are body fluids and tissues, foods, water or soil.

Using the formula

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

We get...

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