Can I get some help solving this, my original answer was (5x-7)(x²+16) but it marked it as wrong.

Verify that the indicated complex number is a zero of the given polynomial function f. 41; f(x) = 5x3 - 7x2 + 80x -112 Yes, 4/ is a zero. O No, 4/ is not a zero. Use the Conjugate Zeros Theorem and long division to find all other zeros. (If there are no other zeros, enter NA. Enter your answers as a comma-separated list. ) Conjugate Zeros Theorem: Let f(x) be a polynomial function of degree n > 1 with real coefficients. If z is a complex zero of f(x), then the conjugate z is also a zero of f (x). X= 5 ' - 4i Give the complete factorization of f(x). f ( x) = (5x - 7) (x2+ 16) X eBook