4x2 + 12 = 4(x2 + 3)4x^2 + 8x + 3x + 6 = 4x(x + 2) + 3(x + 2)
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4x2 + 8x + 4 = 4 (x2 + 2x + 1) = 4 (x + 1)2
Take out the common factor, 3: 3x + 6 = 3(x + 2).
No 9xx-18x+36 9(xx-2x+4) xx-2x+4 (doesn't factor evenly)
The GCF of 2x and 12 is 2.