Answer: y= -x^2+4
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1. Write down the formula:
y=a(x-h)^2+k
2. Find the coordinates.
(H, K is the vertex form)
H, K= (0,4)
X, Y= (1,3)
3. Plug in the numbers into the formula
y=a(x-h)^2+k
3=a(1-0)^2+4
4. Solve for “a”
a= -1
Answer: y= -x^2+4
Pssst.... you can also use Desmos to help you with graphs. :)
Also Desmos is a great way to double check your work.
It is y= -x^2+4 because if you put it into Desmos it gives you the same coordinates and the same graph.
I hope this helped you!