SOLUTION: need to find all the real zeros of each polynomial function. using the zeros to factor f over the real numbers f(x)= 3x3+6x2-15x-30

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Question 180325This question is from textbook sullivan
: need to find all the real zeros of each polynomial function. using the zeros to factor f over the real numbers f(x)= 3x3+6x2-15x-30 This question is from textbook sullivan

Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
3x3+6x2-15x-30
:
3%28x%5E3%2B2x%5E2-5x-10%29
:
we know that possible roots are plus and minus 1,2,5,and 10
:
I found +2 is a root
:

:
so we have3%28x%2B2%29%28x%5E2-5%29
:
3%28x%2B2%29%28x%2Bsqrt%285%29%29%28x-sqrt%285%29%29
:
roots:sytem%28-2%2Csqrt%285%29%2C-sqrt%285%29%29