SOLUTION: Which value must be added to the expression x2 + 16x to make it a perfect-square trinomial?

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Question 823519: Which value must be added to the expression x2 + 16x to make it a perfect-square trinomial?

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Take half of 16 to get 16/2 = 8

Square 8 to get 8^2 = 64

So the answer is 64