x2 + 7x + 6 = (x + 6) (x + 1)
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x2+7x=-2x2+6 3x2+7x-6=0 (3x-2)(x+3)=0 3x-2=0 or x+3=0 x=2/3 or x=-3
-7x + 6 + 7x - 2 = 4
x2+9x+18 find factors of 18 that add up to 9, in this case 6&3 (x+6)(x+3)
The factors are (x + 6) and (x - 3)
3x2 + 15x + 6 = 3*(x2 + 5x + 2). There are no further rational factors.