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
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