Very little factoring.
7X + 4X
X(7 + 4)
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x^2 +7x+12 = (x+3)(x+4) when factored
3x/4 + x = 7x/4 because 4x/4 = x 3x/4 + 4x/4 = 7x/4
(x+3)(x+4) = x²+7x+12
=3x * * * * * The correct answer is: x2 + 7x + 12 = (x + 3)(x + 4).
7x+17 = 45 7x = 45-17 7x = 28 x = 4