Factor the following: 1) xReturn to the tutorial^{2}+ 8x + 16 The constant term, 16, is a perfect square itself. That is, sqrt(16) = 4. We can see that 2(4) = 8 which is the same as the linear coefficient, so the original expression can be written as a perfect square. From the general form: x^{2}+ 2ax + a^{2}= (x + a)^{2}a = 4 in this case and so x^{2}+ 8x + 16 = (x + 4)^{2}