If you mean: x squared+7x+6 then it can be factored to (x+1)(x+6)
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x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
x2-7x+6 = (x-1)(x-6) when factored.
i got 42 divided 7x
x3 + 13x2 + 42x = x(x2 + 13x + 42) = x(x2 + 6x + 7x + 42) = x[x(x + 6) + 7(x + 6)] = x(x + 7)(x + 6)
x2- 7x + 6 = 0 factor, (x-6)(x-1) = 0 x = 6 x = 1