Plz help i completely forgot how to do these things

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

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

(50 points) drag each description to the correct location on the table. each description can be used more than once. some systems of equations and their graphs are given in the table. for each system, place the description(s) in the box that correctly describe the type of system shown. :