3 is a factor and dividing by 3 gives
x + 15 = 8x
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3x
3(x2 + 3x + 1)
3x2 + 10x + 3 = (x + 3)(3x + 1).
9x2 + 6x + 1 = 9x2 + 3x + 3x + 1 = 3x(3x + 1) + 1(3x + 1) = (3x + 1)(3x + 1) or (3x +1)2
9x2 + 12x + 4 = 9x2 + 6x + 6x + 4 = 3x(3x + 2) + 2(3x + 2) = (3x + 2)(3x + 2) = (3x + 2)2