X * x 5x 6 0 July 8, 2019 16 32 64 128 X 3 x 2 5x 6 0 X 4 )( x 2 5x 6 )= 0 X 1 )( x 2 5x 6 )= 0 Tìm x x 2 5x 6 0 5 x 0 X + 5 x