Question

working model of (x+y)^3​

Answer 1

Answer:

$(x+y)^3 = (x+y)(x+y)^2$

             $=(x+y)(x^2+2xy+y^2)$

             $=x^3 +2x^2y+xy^2 + y^3 + 2xy^2 + x^2y$

             $=x^3 + 3x^2y+3xy^2 + y^3$