SOLUTION: Hi, I am having problems with factoring polynomials. {{{X^3 + 5 x^3 +8x +40 }}} I can't figure this one out at all and I have tried using all the factors of 40, but nothing s

Algebra ->  Rational-functions -> SOLUTION: Hi, I am having problems with factoring polynomials. {{{X^3 + 5 x^3 +8x +40 }}} I can't figure this one out at all and I have tried using all the factors of 40, but nothing s      Log On


   



Question 155139: Hi, I am having problems with factoring polynomials.
X%5E3+%2B+5+x%5E3+%2B8x+%2B40+
I can't figure this one out at all and I have tried using all the factors of 40, but nothing seems to work.
Thanks

Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
i think p(x)=X%5E3+%2B+5+x%5E2+%2B8x+%2B40+
then
x=-5 is a root
1 5 8 40
-5 -5 0 -40
1 0 8 0
then P%28x%29=%28x%2B5%29%28x%5E2%2B8%29