Productos y factores

(x+y)(x+y)=x²+2xy+y²

(x-y)(x-y)=x²-2xy+y²

(x+y)(x-y)=x²-y²

(x²+2xy+y²)(x+y)=x³+3x²y+3xy²+y

(x²-2xy+y²)(x-y)=x³-3x²y+3xy²-y³