What is the vertex of the quadratic function y=-x²+6x+7? ​

(3,16)

Step-by-step explanation:

Factor the equation to find out that the roots are 7 and -1. The vertex's x will be in the center of these two points, so the center point between 7 and -1 is 3. Continue to substitute the x in the equation with 3 to get the other coordinate for vertex.

i'm pretty sure it's 477,585,296, but perhaps my math is incorrect.