Question

find the zeros of f(x)=x^3+0x^2-9x-80

Answer 1

im pretty sure u have to use synthetic division

Answer 2

and rational zero/root theorem

Answer 3

The attached plot indicates that there is only one real root, at or near x = 5.
Divided by x-5 .

Answer 4

by hit and trail ,we can get x= 5 as solution then
as x=5 is a solution ,it will satisfy the given equation ,,so
divide equation by (x-5)