exam Maths Puzzle Numerical Ability

PLease help to simplify

x^ay^a/3y^-2

divided by

x^a/2

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exam Other Question

Solve the following quadratic equation by completing the square. I get the first part then i get lost, please help me. x^2-6x-3=0 find the greatest common factor of the given numbers-
66, 144, 42