## Precalculus: Mathematics for Calculus, 7th Edition

(-$\infty$,-3) $\cup$ (1,$\infty$)
$x^{2}$ +2x $\gt$ 3 $x^{2}$ +2x -3 $\gt$ 0 (x+3)(x-1) $\gt$ 0 Factors are zero when x=-3 or x=1,endpoints don't satisfy the inequality, plug values from intervals to decide which of them satisfy the inequality.