Find the vertex of the graph of the equation $y = -2x^2+8x-15$, I've tried this problem and I got (-2, -23) every time, I don't see where I'm going wrong, I need some help with this problem.
When you plug in x = -2, you get -39, so the vertex is (-2,-39).
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