Answer
Our axis of symmetry is 2
Our vertex is ( 2, -9)
Step by step
We can factor x^2 -4x -5
( x -5) ( x + 1)
Our x intercepts are x=5 and x= -1
The halfway point between these points is 2 so your axis of symmetry is 2
To find the x of the vertex use formula
X = - b/2a
X = - -4/2
X = 4/2
X = 2
Now use the value of x = 2 in the original equation y= x^2 -4x -5
y = 2^2 (-4)(2) -5
y = 4 -8 -5
y = -9
I attached a graph to prove my solutions