SOLUTION: Hello! I need help understanding why (x+y)2 is not equal to x2+y2? I am taking an online course and I have viewed my text book but have not seen any problems like this one on how t

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Hello! I need help understanding why (x+y)2 is not equal to x2+y2? I am taking an online course and I have viewed my text book but have not seen any problems like this one on how t      Log On


   

Question 944868: Hello! I need help understanding why (x+y)2 is not equal to x2+y2? I am taking an online course and I have viewed my text book but have not seen any problems like this one on how to solve it. Can you please help me?
Found 2 solutions by richard1234, MathLover1:
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
If you use FOIL or binomial thm, (x+y)^2 is equal to x^2 + 2xy + y^2.

Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

%28x%2By%29%5E2 is square of the sum and it is equal to x%5E2%2B2%26%238290%3Bxy%2By%5E2 and it is a perfect square trinomial
and x%5E2%2By%5E2 is the sum of the squares
why %28x%2By%29%5E2 is not equal to x%5E2%2By%5E2, : because it is a binomial and %28x%2By%29%5E2 is 2%26%238290%3Bxy greater then x%5E2%2By%5E2