SOLUTION: Give the x-intercepts, the table of signs and the sketch of the graph. f(x) = x^3 + 2x^2 - 9x

SOLUTION: Give the x-intercepts, the table of signs and the sketch of the graph. f(x) = x^3 + 2x^2 - 9x - 18

Question 987562: Give the x-intercepts, the table of signs and the sketch of the graph.
f(x) = x^3 + 2x^2 - 9x - 18
Answer by ikleyn(52787) (Show Source): You can put this solution on YOUR website!
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The roots of the polynomial f(x) = are -3, -2 and 3. You can check it directly.

So, the polynomial is factored as = (x+3)*(x+2)*(x-3). The sketch is shown in the Figure.

Figure

Could you make the table of signs yourself?

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