1. **State the problem:** Simplify the expression $$\frac{x^2 - 25}{x^2 + 5x} \div \frac{xy + 6x - 5y - 30}{5x - 15}$$. 2. **Rewrite division as multiplication by reciprocal:** $$\frac{x^2 - 25}{x^2 + 5x} \times \frac{5x - 15}{xy + 6x - 5y - 30}$$ 3. **Factor all polynomials:** - Numerator of first fraction: $$x^2 - 25 = (x - 5)(x + 5)$$ - Denominator of first fraction: $$x^2 + 5x = x(x + 5)$$ - Numerator of second fraction: $$5x - 15 = 5(x - 3)$$ - Denominator of second fraction: factor by grouping: $$xy + 6x - 5y - 30 = x(y + 6) - 5(y + 6) = (x - 5)(y + 6)$$ 4. **Substitute factored forms:** $$\frac{(x - 5)(x + 5)}{x(x + 5)} \times \frac{5(x - 3)}{(x - 5)(y + 6)}$$ 5. **Multiply fractions:** $$\frac{(x - 5)(x + 5) \times 5(x - 3)}{x(x + 5)(x - 5)(y + 6)}$$ 6. **Cancel common factors:** - Cancel $(x - 5)$ numerator and denominator: $$\frac{\cancel{(x - 5)}(x + 5) \times 5(x - 3)}{x(x + 5)\cancel{(x - 5)}(y + 6)}$$ - Cancel $(x + 5)$ numerator and denominator: $$\frac{\cancel{(x + 5)} \times 5(x - 3)}{x\cancel{(x + 5)}(y + 6)}$$ 7. **Simplified expression:** $$\frac{5(x - 3)}{x(y + 6)}$$ **Final answer:** $$\boxed{\frac{5(x - 3)}{x(y + 6)}}$$