Posted by Algebra 2 on Thursday, April 2, 2009 at 9:22pm.
thanks for the help earlier I got one more question
X^413X^2+36
How do I factor this using algebra not just gussing and checking this times this and what number plus what number gives you these numbers
how do i factor that wihtout playing one of those games were you like guess and check your like taught in nineth grade thanks

Algebra 2  Reiny, Thursday, April 2, 2009 at 10:28pm
part of the "game" that I play is to realize that both brackets have to start with x^2 to have x^4 at the front and x^2's in the middle, so ...
(x^2  ...)(x^2  ...)
looking at the +36 at the end, I know my 2 numbers must both have the same sign, since I see a negative in the middle, they must be negative.
Now what two factors of 36 have a sum of 13
Gee, my game tells me it must be 9 and 4
so
(x^2  9)(x^2  4)
at this point you have to recognize the difference of square for both of those.
final result:
(x+3)(x3)x+2)x2)
thanks for playing.
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