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March 26, 2015

March 26, 2015

Posted by **Karlee** on Tuesday, March 26, 2013 at 5:07pm.

f(x)=x^3-2x^2-13x-10

x=

- College algebra -
**Reiny**, Tuesday, March 26, 2013 at 6:01pmf(1) = 1-2-13-10 ≠ 0

f(-1) = -1 - 2 + 13 -10 = 0 , so x+1 is a factor

by synthetic division

x^3 - 2x^2 - 13x - 10 = (x+1)(x^2 - 3x - 10)

= (x+1)(x-5)(x+2) = 0 for roots

x = -1 or x = -2 or x = 5

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