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To complete the square on x^2 + 16x + 63, Patricio needs to find the value that can be added to both sides to create a perfect square trinomial.
Starting with x^2 + 16x + 63, we take half of the coefficient of x (which is 16) and square it to get 64. So the value to be added is 64.
(x^2 + 16x + 64) + 63 - 64
(x + 8)^2 - 1
So the missing pieces are:
A. Term in first blank space: -8
E. Term in second blank space: -1