Rate of Change Calculator
f(x) = c₃x³ + c₂x² + c₁x + c₀
How This Is Calculated
Average rate of change uses the same slope formula as a straight line — rise over run — applied to the curve’s endpoints. Instantaneous rate of change is the derivative at that exact point. Full reasoning in the Limits and Derivatives chapter guide, or find the derivative directly with the Polynomial Derivative Calculator.