Posted by sam on Sunday, February 13, 2011 at 9:54pm.
First of all I changed it into
- (12x^2 - 52x + 35)
After 4 tries I had
- (2x-7)(6x-5) or (7-2x)(6x-5) or (2x-7)(5-6x)
(I use a method where I list the factors of the first and last numbers, and then take sum or differences of cross-products
e.g.
3 2 1 ....... 5 7
4 6 12 ...... 7 5
2x5 + 6x7 = 52, my middle term
This is the fastest way to factor trinomials, too bad nobody seems to teach this method any more.
I came up with -(6x-5)(2x-7)
yes,
that was my first answer I gave you.
surely you realize that
-(6x-5)(2x-7) = - (2x-7)(6x-5)
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