Posted by **Audrey** on Sunday, June 10, 2007 at 7:51pm.

Find the constant term that should be added to make the following expression a perfect square trinomial.

x^2-2x

x^2+3x

Take one half the second term, square it.

1/2 *2=`1, squred, 1

1/2 *3=3/2, squared, 9/4

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