(2x-3)(2x+3) - 1 = 5x + (x-2)^2 4x^2 - 9 - 1= 5x + x^2-4x + 4 4x^2 - x^2 - 5x + 4x - 9 - 1 - 4= 0 3x^2 - x - 14 = 0 D=169 x1=-2 x2=14/6=7/3