# SOLUTION: f(x)=x^3+3x^2-5x^+8 x=4 Could you please help with this problem. The question is to decide whether the x value of 4 is a zero of the function. We can't figure out how to factor the

Algebra ->  Algebra  -> Polynomials-and-rational-expressions -> SOLUTION: f(x)=x^3+3x^2-5x^+8 x=4 Could you please help with this problem. The question is to decide whether the x value of 4 is a zero of the function. We can't figure out how to factor the      Log On

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 Question 123865This question is from textbook McDougal Littell Algebra 2 : f(x)=x^3+3x^2-5x^+8 x=4 Could you please help with this problem. The question is to decide whether the x value of 4 is a zero of the function. We can't figure out how to factor the polynomial.This question is from textbook McDougal Littell Algebra 2 Answer by solver91311(16868)   (Show Source): You can put this solution on YOUR website!You don't need to factor the polynomial to determine if a particular value is a zero. All you need to do is evaluate . If then , so no, 4 is not a zero of the polynomial Actually, this thing has one real zero somewhere near -4.5 and a conjugate pair of complex zeros that would be more work to calculate than I would care to do. Google the general solution of the cubic if you are curious.