SOLUTION: Factor {{{3x^3+15x^2+4x+20}}}

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Question 48982: Factor 3x%5E3%2B15x%5E2%2B4x%2B20
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
3x%5E3+%2B+15x%5E2+%2B+4x+%2B+20
a = 1,2,4,5,10,20
b = 1,3
Possible Roots: +-a/b = +- 1,2,4,5,10,20,1/3,2/3,4/3,5/3,10/3,20/3
Normally, you would try them out, but for a quicker way, look at the graph:
graph%28600%2C600%2C-10%2C10%2C-10%2C30%2C3x%5E3%2B15x%5E2%2B4x%2B20%29
-5|.....3......15.......4........20
..........3.......0........4.......0
(x + 5)(3x^2 + 4)