Algebraic Simplification: (x² - 9)/(x² + 6x + 9)

This visualization shows how the rational function (x² - 9)/(x² + 6x + 9) simplifies to (x - 3)/(x + 3), and why x ≠ -3. The blue curve is the original function, the yellow curve is the simplified function, and the hollow neon point marks the removable discontinuity (hole) at x = -3.