5x 2 4x 7 0 July 8, 2019 16 32 64 128 5x 2 4x 7 0 factorise 2x 3 5x 2 4x 7 0 5x 3 2 4x 7 2 0 Solve quadratic equation 5x 2 4x 7 0 5x2 4x 7 0 by completing square method 5x2 4x 7 0 solve for quadratic formula 0 16 5x 2 )= 0 4x 7 Giải phương trình 5x 3 2 4x 7 2 0 5 x 0