JAMB 1994 · UME · Q13

The curve touches the $x$-axis at $(3, 0)$ and flattens out there, so $(x - 3)$ is a repeated factor, three times over for a cubic.

That suggests $y = (x - 3)^3$.

Check the $y$-intercept: at $x = 0$, $y = (-3)^3 = -27$, which matches the graph.

So the equation is $y = (x - 3)^3$, option A.