1 2 2 4x )= 7 x 1 )- 2 July 8, 2019 16 32 64 128 8 1 2 1 2 4x = 7 1 2 x in i X 2 1 4x 2 1 7x 7 2x Factorise x 2 1 4x 2 1 7x 7 2x 2x 1 )( 4x 2 2x 1 )- 7 x 3 1 tại x =- 1 2 2 2x 1 x 4x 2 1 7 2x 1 X 1 2x 2 4x 7 8x 5 x 4x 2 8x 1 8x 16 F =( 2x 1 )( 4x 2 2x 1 )- 7 x 3 1 tại x =- 1 2 1 - 2 = 4
