exam Maths Puzzle Numerical Ability

I am having a very hard time trying to figure this out. Can you please help me?

Find the axis of symmetry.

y = -x squared + 6x - 2

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exam Other Question

y^3-13y^2+54y-72
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Y-6
Divide:

x^2 + 2x - 15 x^2 - 25
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4x^2 2x - 10

Can anyone help me figure this problem out? Thank you ahead of time for your effort