SOLUTION: (x + 3y) (x - 3y)

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: (x + 3y) (x - 3y)      Log On


   

Question 765094: (x + 3y) (x - 3y)
Answer by lenny460(1073) About Me  (Show Source):
You can put this solution on YOUR website!
(x + 3y) (x - 3y)
x * x = x^2
x * -3y = -3xy
3y * x = 3xy
3y * -3y = -9y^2
Therefore:
x^2 - 3xy + 3xy - 9y^2
Combine like terms:
-3xy + 3xy = 0

Answer:
x^2 - 9y^2









Lennox Obuong
Algebra Tutor
Nairobi, Kenya
Email: lennoxobuong@yahoo.com