Algebra 2

Hey I am working on math homework that involves "Standard Form to Vertex Form by Averaging." My class is just starting to learn this today, but I am totally lost still on what to do. Can you please help? The formula for this is y=a(x - h)^2 + k
the h is the x-value vertex and the k is the y-value vertex.

I got the first one done and it looks like this:

y=-x^2 + 2x +3

-1(x^2 - 2x - 3)

-1(x + 1)(x - 3)
x= -1 and 3

y=-(-1)^2 + 2(-1) + 3
y=-1 + 2 + 3
y= 4

then
h=-1 and k=4
I have many other like this but this was the only one i understood. If any one knows this process i'd be so thankful for some help! Thank you!

asked by Tessa

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