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Mathematics

Grade10

Easy

Question

Find the product. $91 squared$

8281
8761
8161
8521

The correct answer is: 8281

Using the pattern $left parenthesis a plus b right parenthesis squared equals a squared plus 2 a b plus b squared comma$
$91 squared equals left parenthesis 90 plus 1 right parenthesis squared equals 90 squared plus 2 asterisk times 90 asterisk times 1 plus 1 squared equals 8100 plus 180 plus 1 equals 8281$

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