7.6 Exercise 184

Find $R \left(x\right)$ given $f \left(x\right) = \frac{x - 4}{x^{2} - 3 x - 10}$ and $g \left(x\right) = \frac{x - 5}{x^{2} - 2 x - 8} .$

Given the function,
$R \left(x\right) = \frac{2}{2 x^{2} + x - 15} ,$ find the values of $x$ that make the function less than or equal to 0.