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factor x^3+5x^2-3x-15=0

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1 Answer

Hi Shyanna;
x^3+5x^2-3x-15=0
For the FOIL...
FIRST must be (x2)(x)=x3
OUTER must be (x2)(5)=5x2
INNER must be (-3)(x)=-3x
LAST must be (-3)(5)=-15
(x2-3)(x+5)=0
Either parenthetical equation must equal zero...
x2-3=0
x2=3
x=√3
x+5=0
x=-5