If you help me get this right i will mark u as most brilliance!

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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?

(x-5)1/2+5=2 what is possible solution of this equation