SOLUTION: I need to solve this and I am lost. (-y-3x)(-y+3x)

Algebra ->  Equations -> SOLUTION: I need to solve this and I am lost. (-y-3x)(-y+3x)      Log On


   

Question 852878: I need to solve this and I am lost. (-y-3x)(-y+3x)
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%28-y-3x%29%28-y%2B3x%29


-y%28-y%2B3x%29-3x%28-y%2B3x%29 Use the idea that %28a%2Bb%29%28c%2Bd%29=a%28c%2Bd%29%2Bb%28c%2Bd%29


-y%28-y%29-y%283x%29-3x%28-y%29-3x%283x%29 Distribute


y%5E2-3xy%2B3xy-9x%5E2


y%5E2%2B0xy-9x%5E2


y%5E2%2B0-9x%5E2


y%5E2-9x%5E2


=======================================================

So %28-y-3x%29%28-y%2B3x%29 expands and simplifies to y%5E2-9x%5E2