First put it in standard form: <span>x^2 −14x -15 =0 a =1 b =-14 c=-15 Then use the quadratic formula: x = [-b +-sq root (b^2 - 4ac)] / 2a x = [--14 +- sq root (14^2 -4*1*-15] / 2*1 x = [14 +-sq root (196 +60)] / 2 </span><span>x = [14 +- 16] / 2 x1 = 15 x2 = -1
