exam Maths Puzzle Numerical Ability

Factor completely. 12x^3 – 3xy^2 I got 3x(4x – y)(x + y) Is this correct

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exam Other Question

simplify the complex fraction

9^2-16^2y over xy all over 3 over x -4 over x
How do you draw a figure with an area of 64 cm squared and a perimeter of 64 cm????? I have tried trial and error, but it does not seem to be working. Please help me. Thank you.