## anonymous 5 years ago determine the vertex and the axis of symmetry for the function Y=-x^2+2x+1

1. anonymous

$Y=-x^2+2x+1$

2. anonymous

Can Somebody help me please D:

3. anonymous

same magic formula as before. use $\frac{-b}{2a}$ for the first coordinate of the vertex. second coordinate is what you get when you plug it in

4. anonymous

in this case a = -1, b = 2 so $-\frac{b}{2a}=-\frac{2}{2\times(-1)}=1$

5. anonymous

plug in 1 for x and you win. i get -1+2+1=2 so vertex is (1,2)