SOLUTION: Find a rational zero of the polynomial function and use it to find all the zeros of the function. f(x) = x3 + 2x2 - 9x - 18

Algebra ->  Rational-functions -> SOLUTION: Find a rational zero of the polynomial function and use it to find all the zeros of the function. f(x) = x3 + 2x2 - 9x - 18       Log On


   

Question 470011: Find a rational zero of the polynomial function and use it to find all the zeros of the function.
f(x) = x3 + 2x2 - 9x - 18
Answer by sofiyac(983) About Me  (Show Source):
You can put this solution on YOUR website!
0=+x%5E3+%2B+2x%5E2+-+9x+-+18
0=+x%5E2%28x+%2B+2%29+-+9%28x+%2B2%29
0=+%28x%5E2+-+9%29%28x%2B2%29
0=+%28x-3%29%28x%2B3%29%28x%2B2%29
x=3, x=-3, x=-2