~ gửi bạn ~
`1) x^3−8`
` = x^3 - 2^2`
` = (x^2 + 2x + 4)(x - 2)`
`2) x^3 + 8`
` = x^3 + 2^2`
` = (2 + x)(x^2 - 2x + 4)`
`3) (x + 2)^3`
` = x^3 + 3.x^2 . 2 + 3. x . 2^2 + 2^3`
` = x^3 + 8 + 6x^2 + 12x`
`4) (x - 2)^3`
` = x^3 - 3.x^2 . 2 + 3. x . 2^2 - 2^3`
` = x^3 + 12x - 6x^2 - 8`
