exam Maths Puzzle Numerical Ability

I am not sure if you would use the foil method to answer this question or not.
(2x-y)*2. (*2 means squared)
I am confused on this question. I would really appreciate your help. Thanks

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exam Other Question

Solve 2log4 x - log4 9 = 1.

Simplify sqrt5 - 1/sqrt5.

Simplify (-16x^-3y^2/8xy^-4)^-3.

Thanks.
How do you simplify. It is under Problem Set 4.1 number 47.