Step a: = –c + = step b: = determine the justification for the steps from the derivation of the quadratic formula. justification of step a: justification of step b: you get 88 points if you answer!

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?