SOLUTION: Which number must be added to x^2 - 16x to make it a perfect square trinomial? (X squared subtract 16x)

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Question 106098: Which number must be added to x^2 - 16x to make it a perfect square trinomial?
(X squared subtract 16x)
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

to make x%5E2+-+16x+ to a perfect square trinomial, we need to add number 64
x%5E2+-+16x+++%2B64=%28x-8%29%5E2