Graph $y = \left(x − 1\right)\left(x + 3\right)$. For what values of $x$ is the graph less than or equal to zero? Express your answer as an inequality (example: $x \gt 2$, $1 ≤ x ≤ 4$). Was the factored form of the equation easy to graph? Do you see a connection between the equation, the factors, and the solution?