Fill in the blank with a constant, so that the resulting quadratic expression is the square of a binomial. x^2 + 8x + ____
To "complete the square" when the coefficient of the x2 term is 1:
divide the coefficient of the x-term by 2 (8 / 2 = 4)
square this answer (42 = 16)
So, the answer is 16.
