What are the zeros of the polynomial function: f(x) = x3 + 9x2 + 20x ?

0, –5, –4

0, –5, 4

0, 5, –4

0, 5, 4

Question

What are the zeros of the polynomial function: f(x) = x3 + 9x2 + 20x ? 

 0, –5, –4 

 0, –5, 4 

 0, 5, –4 

 0, 5, 4

anonymous · Answer

Thanks again(: lol

nurali · Answer

Anytime.

anonymous · Answer

I'm sorry to point out that there was a mistake that you made Nurali. The original question had +9x^2. You did the math using -9x^2. The zeros are 0, -4, and -5.

nurali · Answer

f(x) = x^3 + 9x^2 + 20x 

x^3 + 9x^2 + 20x = 0
x(x^2 + 9x + 20) = 0
x(x + 4)(x + 5) = 0
x = 0 x + 4 = 0 x + 5 = 0

x = 0 x = -4 x = -5

the zeros are 0, -5, -4