Question

Find the difference without subtracting
$22 {}^{2} and 21 {}^{2}$
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Answer 1

Answer:

Required difference is 43

Step-by-step explanation:

22² - 21²

= (22 + 21)(22 - 21) [applying (a² - b²) = (a + b)(a - b)]

= 43

Therefore, required difference is 43.

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