$t= 7, -4$
Work Step by Step
$t^2-3t=28$ $t^2-3t-28=28-28$ $t^2-3t-28=0$ $(t-7)(t+4)=0$ $t-7=0$ $t-7+7=0+7$ $t = 7$ $t+4=0$ $t+4-4=0-4$ $t = -4$
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