1. Solve each equation, system of equations, or inequality.

a) x4 +4x3 -10x2 -28x-15=0 given (x – 3) and (x + 1) are factors to the polynomial f(x)=x4 +4x3 -10x2 -28x-15

b) x3 -8x-7=0 given (x + 1) is a factor for the polynomial h(x)=x3 -8x-7