Question

Subtract the square of 21 from the square of 21 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

${x}^{2} - {y}^{2} = (x + y)(x - y) \\ </p><p>We \: get... \\ </p><p> = > {(21)}^{2} - {(21)}^{2} \\ = > (21+ 21)(21 - 21) \\ = > 42 \times 1 \\ = > 0.$

Answer 2

Answer:

21 *21 -21*21

0

becoz 21 square is same in both side and when we subtract a number from same number then answer will 0

examples 2-2=0

Step-by-step explanation:

ŚHÄMMŸ 15 HERE

a square - b square = (a-b) a+b

(21-21)*(21+21) =

42 *0 = 0