If x = 4, then the factor is (x - 4); if x = -5, then the factor is (x + 5); if x = 7, then the factor is (x - 7). We need to FOIL all these together to get a third degree polynomial. (x - 4)(x + 5) = (x^2 + x - 20). Now multiply that by (x- 7): (x^2+x-20)(x-7) = . Combine like terms to get , the first choice above.
