http://s3.amazonaws.com/answer-board...2361783842.gif

I completed the sqaure of the equation and came out with (http://s3.amazonaws.com/answer-board...2724665764.gif

Then r = -3

So my answer is http://s3.amazonaws.com/answer-board...8930102972.gif but the answer should be -7t where http://s3.amazonaws.com/answer-board...7903546590.gifis at.

I need help where the -7t came about.