## Intermediate Algebra (6th Edition)

$x^2+x-12$
Using the FOIL Method, $(a+b)(c+d)=ac+ad+bc+bd$, the given expression simplifies to \begin{align*} & (x-3)(x+4) \\\\&= x^2+4x-3x-12 \\\\&= x^2+x-12 .\end{align*}