0 25 x 10 4 July 8, 2019 16 32 64 128 0 25 mũ 10 x 4 mũ 10 X 10 )( 4x2 − 25 )= 0 X 10 )( 4x 2 25 )= 0 0 25 x 4 0 25 × 4 0 25 × 0 4