SOLUTION: Find all zeros of f(x)=3x^3+9x^2-5x-15

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Question 696969: Find all zeros of f(x)=3x^3+9x^2-5x-15
Answer by MathLover1(20849)   (Show Source): You can put this solution on YOUR website!

...set equal to zero

...factor



solutions:
if ....=>...
if ...=>.....=>.....=>... and
or , so we have
and


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