exam Maths Puzzle Numerical Ability

# |z-i|2 and z0 = 5 + 3i ; The maximum value of |iz+z0| is _______
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Please help to simplify the following

-6 times the square root of 2 (5 times the square root of 2 - 5 times the square root of 10)
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