`(x+3)^2=x^2+2x.3+3^2=x^2+6x+9`
`(2x-3)^2=(2x)^2-2.2x.3+3^2=4x^2-12x+9`
`(x+4)^3=x^3+3.x^2.4+3.x.4^2+4^3=x^3+12x^2+48x+64`
`(x-1)^3=x^3-3x^2.1+3x.1^2-1^3=x^3-3x^2+3x-1`
`x^3+8=x^3+2^3=(x+2)(x^2-2x+2^2)=(x+2)(x^2-2x+4)`
`x^3-27=x^3-3^3=(x-3)(x^2+3x+3^2)=(x-3)(x^2-3x+9)`
$@ThanhTruc2008$