Answers

2014-08-09T14:55:31+08:00
(x + y)^2 = (x)^2 + 2(x) (y) + (y)^2
1 1 1
to square trinomials , square the first term , get the product of the first and last term multiplied by 2, square the last term
2014-08-09T14:57:22+08:00
(x + y)^2 = (x)^2 + 2(x) (y) + (y)^2  

1 1 1