Question

[Đỗ Mạnh Hùng]

( 5x -1 ) mũ 3

Answer 1

[Ngô Hải Nam]

`(5x-1)^3`

`=(5x)^3 -3*(5x)^2 *1+3*5x*1^2 -1^3`

`=125x^3 -75x^2 +15x-1`

Answer 2

[Đinh Trung Hiếu]

$(5x-1{)}^3$

$=(5x{)}^3-3\ast (5x{)}^2\ast 1+3\ast 5x\ast 1^2-1^3$

$=125x^3-75x^2+15x-1$