Answer
{$-12,7$}
Work Step by Step
Factoring the equation and setting the factors equal to zero, we obtain:
$y^{2}+5y=84$
$y^{2}+5y-84=0$
$y^{2}-7y+12y-84=0$
$y(y-7)+12(y-7)=0$
$(y-7)(y+12)=0$
$(y-7)=0$ or $(y+12)=0$
$y=7$ or $y=-12$
Therefore, the solution set is {$-12,7$}.
