can someone pls help me??

Two competing engineers have offered their solutions for the function. One has suggested g(x) = x3 – 2x2+ 4x – 8, and the other has suggested h(x) = x3 + 5x2 – 8x – 48. Explain to the C.E.O. of Oaville Lake Amusement Park why these other suggestions are invalid. Use complete sentences.

I am having trouble with problem in my assignment. I think you solve, and had have proof that if its right are wrong by using the mathematical theorems?
ex. The Rational Root Theorem,The Fundamental Theorem of Algebra

Question

can someone pls help me??

Two competing engineers have offered their solutions for the function. One has suggested g(x) = x3 – 2x2+ 4x – 8, and the other has suggested h(x) = x3 + 5x2 – 8x – 48. Explain to the C.E.O. of Oaville Lake Amusement Park why these other suggestions are invalid. Use complete sentences.

I am having trouble with problem in my assignment. I think you solve, and had have proof that if its right are wrong by using the mathematical theorems? 
ex.  The Rational Root Theorem,The Fundamental Theorem of Algebra