Question

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

Answer 1

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Answer 2

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...

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