Question

What is the vertex of `y=4x-x^2`?

Answer 1

(2,4)

Explanation:

`(-b)/(2a)` gives the X coordinate of the vertex

`(-4)/(2xx-1)=(-4)/(-2)=2`

Put x=2 into `y=4x-x^2`

`y=4xx2-2^2`

`y=8-4. => y =4`