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:

The square of 21 = 441

The square of 22 = 484

Now just substract (22)² - (21)²

= 484 - 441 = 43

hope it helps u.....♥