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PhoenixFire
Group Title
Factoring a cubic polynomial.
\[x^3108x^2+3564x34992\]
I haven't needed to factor a cubic in a while and have forgotten how. Any help? I know the answers, just can't get them.
 one year ago
 one year ago
PhoenixFire Group Title
Factoring a cubic polynomial. \[x^3108x^2+3564x34992\] I haven't needed to factor a cubic in a while and have forgotten how. Any help? I know the answers, just can't get them.
 one year ago
 one year ago

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Kitt020912 Group TitleBest ResponseYou've already chosen the best response.0
I know how to factor, but explaining it to someone is complicated. I haven't factored in so long either. I'll try to explain it. Sorry if I'm no help.. :/
 one year ago

maddyx Group TitleBest ResponseYou've already chosen the best response.0
http://answers.yahoo.com/question/index?qid=20080417160912AAt8IHC This could help :)
 one year ago

Kitt020912 Group TitleBest ResponseYou've already chosen the best response.0
Sorry I can't help you. >_< I'm a failed Amby on my first day. :c
 one year ago

drawar Group TitleBest ResponseYou've already chosen the best response.1
\[\begin{array}{l} {x^3}  108{x^2} + 3564x  34992 \\ = x({x^2}  108x + 2916) + 648(x  54) \\ = x{(x  54)^2} + 648(x  54) \\ = (x  54)({x^2}  54x + 648) \\ = (x  54)(x  36)(x  18) \\ \end{array}\]
 one year ago

Boblovesmath Group TitleBest ResponseYou've already chosen the best response.0
@drawar from where did you 2916?
 one year ago

Boblovesmath Group TitleBest ResponseYou've already chosen the best response.0
I know but it is not found in the original equation.
 one year ago

drawar Group TitleBest ResponseYou've already chosen the best response.1
Yes but you have to bring it in, and subtract it later, that's the one and only trick when doing factorization of polynomials.
 one year ago

Boblovesmath Group TitleBest ResponseYou've already chosen the best response.0
Where did you subtract it? And in which course did you take this?
 one year ago

drawar Group TitleBest ResponseYou've already chosen the best response.1
3564=2916+648
 one year ago

drawar Group TitleBest ResponseYou've already chosen the best response.1
I don't remember which course, I think it's common sense, no?
 one year ago

Boblovesmath Group TitleBest ResponseYou've already chosen the best response.0
Can you please explain the before the last step? I don't get it, how did you reach to that point?
 one year ago

Boblovesmath Group TitleBest ResponseYou've already chosen the best response.0
@drawar
 one year ago

drawar Group TitleBest ResponseYou've already chosen the best response.1
Use a calculator to get 2 roots
 one year ago
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