exam Maths Puzzle Numerical Ability

Find the axis of symmetry.
y=-x^2-10x+7

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

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exam Other Question
Please help to simplify

3i - 2i^2 + 3

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the square root of -16 - the square root of -2 times the square root of -2 How many different integer factors does 2004^4 have?