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posted by Gilda on Tuesday, October 4, 2011 at 5:48am.

*I'm a bit confused with this qn* Expand and Simplify 3(3x-y)^2

3(3x-y)^2 = 3(3x-y)(3x-y)= 3(9x^2 - 3xy - 3xy + y^2) = 27x^2 - 18xy + 3y^2

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