Why it matters

• Spot restrictions fast so you don’t divide by zero.
• Simplify rational expressions correctly (and keep track of what gets excluded).
• Understand vertical asymptotes and what they mean on a graph.
• Recognize holes (removable discontinuities) and how to find them.
• Use horizontal and slant asymptotes to predict end behavior.
• Solve rational equations safely and interpret results with constraints.

Tip: Always check your final answers against domain restrictions.