Question

Find the coordinates of the vertex : y=-x^2+2x+1

Answer 1

the x-coordinate of the vertex is obtained by x = -B/(2A)

Answer 2

What about the y?

Answer 3

put -b/2a to get y .

Answer 4

I thought that was to get x?

Answer 5

once you get the x-coordinate, use y = -x^2 + 2x + 1 to get the y-coordinate

Answer 6

Ok thanks!

Answer 7

If you're not a fan of remembering -b/(2a), you can always try completing the square and rewriting the quadratic in vertex form
\[y=a(x-h)^2+k,\text{ where $(h,k)$ is the vertex.}\]