exam Maths Puzzle Numerical Ability

Find the center and radius by completing the square!
x^2+y^2-4ax-6ay+4a=0

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exam Other Question

Points X (-1,1),Y (3,5), and Z (17,1), are the coordinates of three vertices of a parallelogram. What are the possible coordinates of W, the fourth vertex? Express using a positive exponent.

1/y^-7 This is supposed to look like a fraction with a negative exponent.