book Maths Puzzle Numerical Ability

15. In a certain game, a large container is filled with red, yellow, green, and blue beads worth, respectively, 7, 5, 3, and 2 points each. A number of beads are then removed from

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book Other Question
x^2-9y^2
_________ / (x^2-3xy)
7x^2+21y

This is what I have so far...

(x-3y)(x+3y) over (?) * (times) 1 over (x^2-3xy)

I cant figure out how to factor the denomoniator i I have a question..I Have my S.A.T.'s and I am not very good at MATH in genereal since there will be Algerbra and Gemoetry..and I am confused where CAN I LOOK for help? Is there a