Rational zero of 5x^3 - 3x^2 + 7x - 9?

Question

I dont get this question. "which number is a possible rational zero for

f(x)=5x^3-3x^2+7x-9" "(answers) (A.5) (B.-5) (C.-(9/5)) (D.(5/9))" any help would be great.

Answer 1

There is one real root, and two complex. The real root is x = 1, and isn't any of the answers that you have to pick from.

Answer 2

The solution is 1

It is none of the answers given above.

Plug x=1

5(1)^3-3(1)^2+7(1)-9

5-3+7-9 = 0

Answer 3

plug the numbers into x to determine