Question

calcule

$a)7 {}^{2}$
$b)( - 9) {}^{2}$
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Answer 1

$\sf a) \: \: {7}^{2} = 7 \times 7 = 49$

$\sf b) \: \: {( - 9)}^{2} = ( - 9) \times ( - 9) = 81$