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g(x) = x/2
It is [(2a+2h+5) - (2a+5)]/h = 2h/h = 2
4x2 + 12x + 5 = 4x2 + 2x + 10x + 5 = 2x(2x+1) + 5(2x+1) = (2x+1)(2x+5)