Answer
$$ x=-2,3$$
Work Step by Step
To solve an equation set equal to zero using a graph, we see where the graph intersects the x-axis. Thus, we can use the reverse method, solving the equation by setting it equal to zero to see what the x-intercepts are. Doing this, we find:
$$ 0=x^2-x-6 \\ 0=\left(x+2\right)\left(x-3\right) \\ x=-2,3$$