Your image attached has not  sufficient criteria for Brainly users to answer. We will assume for now that you are asking what the line is equal to. This question will be deleted eventually due to Brainly ToS most likely
We note that this line is not linear, or squared. This means it might be cubical.
If it is cubical the line must be a variant of
f(x)=[tex]x^{3}[/tex].
However f(x)=[tex]x^{3}[/tex] points the opposite direction so we must make it negative.
We also noticed we had to stretch it, so we had to add a fraction.
Your answer is f(x)=[tex]-\frac{1}{8} x^{3}[/tex]
