Homework Help: Math check

Posted by Shawn on Sunday, November 9, 2008 at 5:04pm.

Complete the square: x^2 -12x. Which of the following is the correct perfect-square trinomial?
the answers are:
a.) x^2 +22x+121
b.) x^2 -10x+25
c.) x^2 -20x+44
d.) x^2 -12x+36
This is tough because the answers could be a.) b.) and d.)
I am not sure which to choose.

Math check - bobpursley, Sunday, November 9, 2008 at 5:30pm
You are seeing something the rest of us isn't. Only one answer has -12x in it.
Math check - Matthew, Sunday, November 9, 2008 at 5:44pm
To complete the square, you divide the number before the x by 2, square it, and add it to the end. The answer is d.

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