SOLUTION: The question is: Factor the polynomial completely: 9y^2-49x^2 I'm not really sure how to approach this because I don't see a common factor between them. thanks so much

Question 565470: The question is: Factor the polynomial completely:
9y^2-49x^2
I'm not really sure how to approach this because I don't see a common factor between them.
thanks so much
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Think "difference of squares"
we can rewrite:
9y^2-49x^2
as
(3y)^2-(7x)^2
now we can facto as:
(3y - 7x)(3y + 7x)

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