Integrating Expressions of the Form (ax+b)/x

Split a simple expression like (x+3)/x into 1 + 3/x and integrate termwise to get x + 3\ln|x| + c.

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Learning objective overview

Master Teaching Guide coverage for this objective.

Current NZC (2007)
  • No direct alignment recorded
New NZC (2026)
  • NZC26-P4-ALG-ER-K-Y9-04

Resources

Terminology

  • Term-by-term division
  • Natural logarithm
  • Rational expression
  • Numerator and denominator
  • Constant of integration

Task goals

  • Foundation: Split a simple expression like (x+3)/x into 1 + 3/x and integrate termwise to get x + 3\ln|x| + c.
  • Proficient: Integrate expressions with larger numerators and non-unit coefficients, such as (2x^2+5x-4)/x, requiring division into multiple terms with mixed powers before integrating.
  • Excellence: Integrate more complex rational expressions requiring careful algebraic rearrangement (including negative or fractional terms) and evaluate as a definite integral, interpreting the result in context.

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