Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
A horizontal line y = b that a rational function's graph approaches as input values increase or decrease without bound, occurring when neither polynomial dominates or when the denominator dominates.
AP course connection
Topic 1.7: 1.7 Rational Functions and End Behavior