Work Step by Step
$2z^2-21z-36=0$ $2z^2-24z+3z-36=0$ $2z(z-12)+3(z-12)=0$ $(2z+3)(z-12) = 0$ $2z+3 = 0$ $2z+3-3 =0-3$ $2z = -3$ $2z/2 = -3/2$ $z = -1.5$ $z-12 = 0$ $z-12+12 = 0+12$ $z = 12$
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