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March 28, 2015

March 28, 2015

Posted by **sam** on Wednesday, April 11, 2012 at 10:23pm.

- math -
**Reiny**, Wednesday, April 11, 2012 at 10:35pmI don't know what method you are learning.

One of the popular methods these days seems to be

the "decomposition" method

multiply first times last: 15(-8) = -120

look for factors of -120 which add up to -14

how about +6 and -20 ?

their sum is -14

so 15x^2 - 20x + 6x - 8

= 5x(3x-4) + 2(3x-4)

= (3x-4)(5x+2)

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