3x2 - 15x + 42 = 3*(x2 - 5x + 14) which cannot be factorised further.
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The GCF is 15x^2y^2
15x minus 8=minus 180 3x+8=24
you just add 6x+9x to get 15x then minus 25 from 18 to get -7 thus the answer will be 15x-7
-15x=-5*3x+2 -15x=-15x+2 +15x +15x ----------------- 0=2
-x - 2 + 15x = 14x - 2