4x + 3 doesn't factor. It is in its simplest form.
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x2 + 4x + 3 =(x + 3) (x + 1)
(2x+3)(2x+4)
16X + 12X all I can see here is factoring out a 4X factor 4X(4 + 3) ---------------
2(x^2 + 2)(x + 3)
x3 + x2 + 4x + 4 = (x2 + 4)(x + 1)