## Precalculus (10th Edition)

$x=-4$ or $x=1$
Subtract $4$ from each side: $x^2+3x-4=0$ Factor the trinomial to obtain: $x^2+3x-4=0\\ (x+4)(x-1)=0$ Use the Zero-Product Property to obtain: $x+4=0$ or $x-1=0$ Hence, $x=-4$ or $x=1$