Question

What is the axis of symmetry and vertex for the graph `f(x) = x^2 - 4x`?

Answer 1

Axis is x = 2 and vertex is (2, `-`4 )

Explanation:

The equation can be rearranged to the form
`( x-2 )^2` = y + 4 = 4 x 1/4 X ( y + 4.)
The focus is at `( 2, -4+1/4 )`= ( 2, `-`15/4 ).