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:

Heya!

Here are your steps!

${a}^{2} - {b }^{2} = (a + b)(a - b)$

=> (22+21)(22-21)

=> (43)(1)

=> 43

Hope it helps!

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