SOLUTION: What must be added to x2^-7x to make it a perfect square?

Question 1009335: What must be added to x2^-7x to make it a perfect square?
Found 2 solutions by fractalier, MathLover1:
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
You take half the x-term coefficient and square it...thus from
x^2 - 7x, we take half of -7 and get -3.5, then square it and get
12.25
so that x^2 - 7x + 12.25 = (x - 3.5)^2
a perfect square...
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

.......recall:; so, to make it perfect square we need to add
...when you compare it to , you see that and
now we can find :
=>=>
then we have:

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