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

x to the power of 2 + 2x - 15 Algebraically determine the zeros of each of the following exponential functions:
a)f(x)=(4(^-4x)) -sqrt64
b)f(x)=(sqrt3*5(^-(2x-4))-sqrt75
c)f(x)=(4(1/2)^2x)-64