(a+b)^2=
(a+b)(a-b)=
(a-b)^2
(x+a)(x+b)=
(a-b)^3=
(a+b)^3=
a^3-3(a^2)b+3a(b^2)-b^3
a^2-2ab+b^2
a^2-b^2
a^2+2ab+b^2
a^3+3(a^2)b+3a(b^2)+b^3
x^2+(a+b)x+ab
