Functions

$\left[-4,-\frac{3}{2}\right] \cup\left[\frac{2}{3}, 4\right]$

$\left(-\infty,-\frac{3}{2}\right] \cup\left[\frac{2}{3}, \infty\right)$

$[-4,4]$

$\left[-\frac{3}{2}, \frac{2}{3}\right]$