For the function $y=(x-3)(x + 6)$,
its $y$-intercept is
its $x$-intercepts are $x=$
Note: If there is more than one $x$-intercept write the x-values separated by commmas.
When $x\to \infty$, $y \to$ $\infty$ (Input + or - for the answer)
When $x\to -\infty$, $y \to$ $\infty$ (Input + or - for the answer)