Question

Find the vertex of the function h(x) = x2 – 4x – 21

Answer 1

Answer: (2, -25)

Explanation:

The x coordinate of the vertex is
`x=-(-4)/(2(1))=2`.

When x=2,
`h(2)=2^2 - 4(2)-21=-25`.

So, the vertex is (2, -25).