(x+y)^3 expand

Answer 1

(a + b)^3= a^3 + 3*a^2*b + 3*a*b^2 + b^3

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

Answer 2

and also look up "binomial expansion" and "Pascal's triangle". I will post links in a second.

Answer 3

and also look up "binomial expansion" and "Pascal's triangle". I will post links in a second.
here;

http://www.regentsprep.org/Regents/math/algtrig/ATP4/bintheorem.htm

http://en.wikipedia.org/wiki/Pascal%27s_triangle