Question

2x(4x trừ 1) trừ (4x trừ 2) (2x cộng 1) tìm  X

Answer 1

2x(4x-1)-(4x-2)(2x+1)

=8x² -2x-(8x²+4x-4x-2)

=8x²-2x-8x²+2

=2-2x