Question

Find the axis of symmetry and the coordinates of the vertex of the graph of the function
y=-4x(squared)+3

Answer 1

The axis of symmetry is found at x = -b/2a
In your example a = -4 b = 0 because there are no x terms.

So.. x = 0/-8 = 0
x = 0 is the line of symmetry

Then plug in x = 0 and that will give you the y value of the vertex.
-4*0^2 + 3 = 3

So your vertex is at (0,3)

Answer 2

Find the axis of symmetry and the coordinates of the vertex of the graph of the function
y=1/4x(squared)+8x