Solving Second-Order Differential Equations

Find the auxiliary (characteristic) equation of a given second-order homogeneous differential equation and solve it for real, distinct roots to write the general solution.

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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

  • Second-order differential equation
  • Auxiliary equation
  • Characteristic equation
  • Homogeneous equation
  • Real distinct roots
  • Repeated root
  • Complex conjugate roots
  • General solution
  • Particular solution

Task goals

  • Foundation: Find the auxiliary (characteristic) equation of a given second-order homogeneous differential equation and solve it for real, distinct roots to write the general solution.
  • Proficient: Solve second-order homogeneous differential equations with repeated or complex conjugate roots, writing the general solution in the appropriate exponential, linear-exponential, or trigonometric form.
  • Excellence: Apply given initial or boundary conditions to determine a particular solution of a second-order differential equation, including in an applied context such as motion or growth/decay.

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