Question

$(y - 8) {?}^{2} = 9$

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Answer 1

$\sf </p><p>=(y-8)^2=9 \\\\\sf</p><p>=y-8=\sqrt{9} \\\\\sf</p><p>=y-8=3 \\\\\sf</p><p>=y=8+3 \\\\\sf</p><p>=\boxed{11}</p><p>$