2x2+14x
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14x - 14 = 2x + 46 14x - 2x = 46 + 14 12x = 60 x = 5
2x + 12x = 14x then include the -9 so the asnwer is 14x-9.
4x2 + 28x + 49 = 4x2 + 14x + 14x + 49 = 2x(2x + 7) + 7(2x + 7) = (2x + 7)(2x + 7) or (2x + 7)2
x=7
2x2 + 21x + 49= 2x2 + 14x + 7x + 49= 2x(x + 7) + 7(x + 7)= (x + 7)(2x + 7)