exam Maths Puzzle Numerical Ability

What is the diameter of the circle whose area is 36PI

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exam Other Question

I am lost on what to do with is the given data. The question is;
Determine the vertex of the parabla: y=(x+2)^2
What is the axis of symmetry?

I know the axis of symmetry is h but how do I find the h?

Thank you for your time Solve.

x squared - 4x = 12