f(x) = x2 - 4x - 21.
![fx x2 4x 21 class=](https://us-static.z-dn.net/files/d25/59d2d20dce196522472dbc893a7925f6.png)
Answer:
y-intercept = (0,-21)
vertex = (2,-25)
Step-by-step explanation: