I think you mean
6x2-15x-21
2x2-5x-7
2x2-7x+2x-7
x(2x-7)+1(2x-7)
(x+1)(2x-7)
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9xy2 - 24xy + 15x
15(x-3) :)
5x(2x - 3)
The greatest common factor of 12xy2 + 6x is 6x. The greatest common factor of 12 and 6 is 6, and the greatest common factor of xy2 and x is x. If you took 6x out of both factors, the end result would be 2y2+1
x2 + 6x - 2 can not be factored