Question 180369
:g^2-18g+c 
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lets set aside the c for a moment
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we are working with the x squared term and the x term when completing a square.
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here's how it works . Take the absolut value of the coefficient of the x term in our case the number is -18 , but again its the absolute value so we are working with 18. Now divide that value by 2. 18/2=9. Now we take that value, 9 in our case and square it. {{{9^2=81}}}. We now have the number to complete the square
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{{{g^2-18g+highlight(81)}}} see that number 81. That is the value of c
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we end up with 
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{{{(g-9)^2}}}