exam Maths Puzzle Numerical Ability

I have posted this question twice, so if someone could please show some mercy and answer this in a detailed, easy to follow step by step process, I would be so very grateful!

Find the axis of symmetry
y=x^2+7x+5

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exam Other Question
The exact questions reads from the teachers worksheet (not in a book):
Put ay^2-2x-20y+94 into the following format x=a(y-k)^2 +h.

How do I set up the problem?

Thank you for 2(y)^3/4-y^3/4