X 4 x 2 0 solve July 8, 2019 16 32 64 128 X 2 4x 2 0 solve by factoring X 2 4x 4 0 solve by factoring Solve x 4 x 2 90 0 X 2 4x 0 solve X 2 4x 4 0 solve X 2 4x 0 solve by completing the square X 2 4x 0 solve the equation Solve x 4 x 2 1 0 Solve x 4 x 2 12 0 Solve x 4 x 2 20 0 2 x square x 4 0 solve by quadratic formula