MathematicsCalculusA-Level
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Integral of x^n Calculator

The power rule for integration.

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Integral Value

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Overview

The Power Rule for integration provides a systematic way to find the antiderivative of a variable raised to a constant power. It dictates that the integral is found by increasing the exponent by one and dividing the expression by this new exponent value.

Symbols

Variables

I = Integral Value, x = x Value, n = Power

Integral Value
x Value
Power

Apply it well

When To Use

When to use: Use this rule when integrating power functions of the form xⁿ where n is any real number. Note that this specific formula applies only when the exponent n is not equal to -1, as that case requires a logarithmic solution.

Why it matters: This formula is the cornerstone of calculus used to calculate areas under curves, work done by variable forces, and moments of inertia. It allows engineers and scientists to move from rate-of-change models back to total accumulation models.

Avoid these traps

Common Mistakes

  • Decreasing power.
  • Using for n=-1 (use ln).

One free problem

Practice Problem

Find the value of the integral I = ∫ xⁿ dx given n = 2 and x = 3, assuming the constant of integration C is 0.

x Value3
Power2

Solve for:

Hint: The integrated form is x³ / 3.

The full worked solution stays in the interactive walkthrough.

References

Sources

  1. Stewart, Calculus: Early Transcendentals
  2. Thomas' Calculus
  3. Wikipedia: Antiderivative
  4. Stewart, James. Calculus: Early Transcendentals. 8th ed. Cengage Learning, 2016.
  5. Thomas, George B., et al. Thomas' Calculus. 14th ed. Pearson, 2018.
  6. Stewart Calculus Early Transcendentals
  7. Wikipedia: Power rule (calculus)
  8. Standard curriculum — A-Level Pure Mathematics