Answer
$y\geq x^3-4x$
Work Step by Step
According to the given graph and the equation, our inequality is:
$y\geq x^3-4x$.
This includes the shaded area and the function itself (because we have an equals sign). Notice that we used a "greater-than or equals" sign to shade the graph above the curve (up) as well as the function itself.
We confirm the inequality by plugging in $(0,0)$, which gives us:
$0\geq0^3-4(0)$
This is a true statement, as expected since the point $(0,0)$ is included in the inequality. So the inequality works.
