19
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3x2 + 36x + 81 = 3(x2 + 13x + 27)
3x2 + 36x + 81 = 3(x2 + 12x + 27) = 3(x + 3)(x + 9), which are its prime factors; or, if you prefer, 3x2 + 36x + 81 = (3x + 9)(x + 9), which is also accurate. You may easily verify these results by multiplying back.
(3X + 9) (X + 9)
3x2+7-6 = (3x-2)(x+3) when factored
3x2= 6 6-(4x-2)= 6--8= 6+8 = 14 14+7 = 21