(x-3)(x^2+3x+9)=x³-27 (2x+1)( 4x²-2x+1 )=8x^3+1( x-y )(x^2+xy+y^2)=x^3-y^3(a²-b²)(a²+ab+b²)(a²-ab+b²)=(a+b)(a-b)(a²+ab+b²)(a²-ab+b²)=(a+b)(a²-ab+b²)[(a-b)(a²+ab+b²)]=(a³+b³)(a³-b³)
