Find the vertex of the graph of the equation $y = -2x^2 + 8x - 15.$

When you plug in x = -2, you get -39, so the vertex is (-2,-39).

The x coordinate of this dome shaped parabola's vertex will be given by   x = - b/2a      where b = 8     and   a = -  2     

      x = 2

use this value in the equation to calculate the y coordinate as   - 7

vertex is (2, -7)

Hey there, ICL!

So, sometimes when you can't solve an equation, you can plug it into a Desmos Graphing Calc and then you'll be able to see the vertex.

EP is right about this one, x=2 and y= -7; here's the link to the graph: https://www.desmos.com/calculator/9nnq18slcn.

Hope this helped! :)

( ﾟдﾟ)つ Bye