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PhoenixFire
 2 years ago
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.
PhoenixFire
 2 years ago
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.

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Kitt020912
 2 years ago
Best ResponseYou've already chosen the best response.0I 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.. :/

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

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

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

Boblovesmath
 2 years ago
Best ResponseYou've already chosen the best response.0@drawar from where did you 2916?

Boblovesmath
 2 years ago
Best ResponseYou've already chosen the best response.0I know but it is not found in the original equation.

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

Boblovesmath
 2 years ago
Best ResponseYou've already chosen the best response.0Where did you subtract it? And in which course did you take this?

drawar
 2 years ago
Best ResponseYou've already chosen the best response.1I don't remember which course, I think it's common sense, no?

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

drawar
 2 years ago
Best ResponseYou've already chosen the best response.1Use a calculator to get 2 roots
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