SOLUTION: what is 9y^2-49 factored?

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: what is 9y^2-49 factored?      Log On


   

Question 621099: what is 9y^2-49 factored?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
what is 9y^2-49 factored?
.
Think "difference of squares"
where if you have:
a^2 - b^2
you can factor as:
(a-b)(a+b)
.
Your equation:
9y^2-49
can be rewritten as:
(3y)^2-7^2
(3y-7)(3y+7)