Question

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

Answer 1

Answer: (2, -25)

Step-by-step explanation:

The x coordinate of the vertex is $x=-\frac{-4}{2(1)}=2$.

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

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