Related Post: X 2 9x 15 0 3x 2 9x 15 0 X 3 9x 2 23x 15 0 Solve The Quadratic Equation X 2 9x 15 0 F X )= 0.9 X 2 9x 15 Solve By Cardan's Method X^3-9x^2-9x-15=0 3x 5 2 9x 15 0 15 4 5x X 9x 2 4 )= 0 (x+15)^2-10=0