exam Maths Puzzle Numerical Ability

find the center and radius of the circle given by x(squared)- 4x + y(squared) -6y + 12 = 0

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exam Other Question

(3x+y)^5

Set up is
1 5 10 10 5 1
Simplify (-2a^2 b^3)^2/(2a^2 b)^3