math
posted by sam .
can you show me step by step how to factor 15x^214x8

math 
Reiny
I 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(3x4) + 2(3x4)
= (3x4)(5x+2)
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