exam Maths Puzzle Numerical Ability

Please help to simplify

3i - 2i^2 + 3

DIvided by

the square root of -16 - the square root of -2 times the square root of -2

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exam Other Question

I have a question that states: find f(-2) for the function f(x)=2^4x-1 Find the axis of symmetry.
y=-x^2-10x+7

I am still not getting this, can you assist one more time?
Thanks