Question

Rút gọn biểu thức:

(6x +1).(x +5) - (3x + 5).(2x - 10)

Answer 1

(6x + 1)(x + 5) - (3x + 5)(2x - 10)

= (6x + 1)(x + 5) + 5(3x + 5)(x + 5)

= 5(x + 5)(6x + 1 + 3x + 5)

= 5(x + 5)(9x + 6)

Answer 2

Ta có: (6x +1).(x +5) - (3x + 5).(2x - 10)

= 6x² + 30x + x + 5 - 6x² + 30x - 10x + 50

= 51x + 55