What should be done to x^2+ 15x in order to create a perfect square?

How do i do this activity, is appreciated

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?