Question

What is/ how do you calculate the vertex for a parabola with this equation: y=-1x^2+13x?

Answer 1

I'm literally doing this right now for homework. Use the equations y= ax^2+bx+c and -b/2a

Now plug in -13/2(-1)= -13/-2= 6.5 is the x coordinate

Plug in 6.5 for x into y= -1x^2+13x
-1(6.5)+13(6.5)= 78

Now I don't know if (6.5,78) is correct for the vertex but I tried. I'm sorry if I'm wrong