Solve the inequality $LaTeX: \displaystyle \frac{3}{x^{2} - 25}<\frac{4}{x^{2} + 2 x - 15}$

Getting zero on one side and factoring gives $LaTeX: \displaystyle - \frac{4}{\left(x - 3\right) \left(x + 5\right)} + \frac{3}{\left(x - 5\right) \left(x + 5\right)}< 0$ . This gives the least common denominator as $LaTeX: \displaystyle \left(x - 5\right) \left(x - 3\right) \left(x + 5\right)$ . Building each fraction to get the common denominator gives $LaTeX: \displaystyle \frac{3 x - 9 - (4 x - 20)}{\left(x - 5\right) \left(x - 3\right) \left(x + 5\right)} < 0$ . Simplifying gives $LaTeX: \displaystyle \frac{11 - x}{\left(x - 5\right) \left(x - 3\right) \left(x + 5\right)}<0$ . The inequality can change signs at the zeros of the numerator, $LaTeX: \displaystyle \left\{11\right\}$ , or the zeros of the denominator $LaTeX: \displaystyle \left\{-5, 3, 5\right\}$ . Making a sign chart gives: This gives the solution $LaTeX: \displaystyle \left(-\infty, -5\right) \cup \left(3, 5\right) \cup \left(11, \infty\right)$