English, asked by njsjjsnnssbbbabb, 10 months ago

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

Answers

Answered by Anonymous
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.

Answered by arhama6691
0

Explanation:

(20  + 2) ^{2}  - (20 + 1)^{2}  \\  {20}^{2}  + 2 \times 2 \times 20 +  {2}^{2}  - {20}^{2}  + 2 \times 20 + 1 \\ 400 + 4 \times 20 + 4 - 400 + 40 + 1 \\ 80 + 4 - 40 + 1 \\ 84 - 41 \\ 43

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