Posted by **Melissa** on Sunday, October 2, 2011 at 6:06pm.

i tried these quesions so manytimes , but i just cant get he rigt answer !

1.) 4(2-a)^2-81

2.) -(x-y)^3

3.)3x^2-27(2-x)^2

4.) 9(y-1)^2-25

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