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Calcolatrice di integrali

Questa calcolatrice di integrali (per polinomi) trova primitive e integrali definiti in modo esatto, mostrando la regola della potenza per ogni termine.

Usa ^ per le potenze, es. 4x^3 - x + 2

Risultato

Inserisci i valori e premi Calcola per vedere il risultato.

Formula

∫axn dx=an+1xn+1+C\int a x^n \, dx = \frac{a}{n + 1} x^{n+1} + C

The reverse power rule (for n ≠ −1).

∫abf(x) dx=F(b)−F(a)\int_a^b f(x)\,dx = F(b) - F(a)

The fundamental theorem of calculus.

Come usare questa calcolatrice

  1. Type the polynomial and choose indefinite or definite.
  2. For a definite integral, enter the lower and upper limits.

Esempi svolti

∫ from 0 to 2 of 3x² dx

An antiderivative of 3x² is x³.

F(2) − F(0) = 8 − 0 = 8.

Easy: an indefinite integral

Add 1 to each power and divide by the new power: x² → x³/3, and 4x → 4x²/2 = 2x².

∫(x² + 4x) dx = x³/3 + 2x² + C.

Hard: a definite integral with a negative limit

Antiderivative: F(x) = x³/3 − x² + 3x.

F(2) = 8/3 − 4 + 6 = 14/3 and F(−1) = −1/3 − 1 − 3 = −13/3.

∫ from −1 to 2 = F(2) − F(−1) = 14/3 + 13/3 = 27/3 = 9.

Errori comuni

  • Forgetting + C on an indefinite integral.
  • Subtracting the wrong way: a definite integral is F(upper) − F(lower).
  • Sign slips at a negative limit: F(−1) = −1/3 − 1 − 3, and subtracting it adds 13/3.

Domande frequenti

Can it do partial fraction integration?

Not directly — it integrates polynomials. For a fraction such as 1/((x − 1)(x + 2)), split it first with the Partial Fractions Calculator; each simple fraction then integrates to a logarithm.

What is + C?

Any constant differentiates to zero, so every antiderivative is defined up to a constant C.

Can it integrate sin x or eˣ?

This calculator handles polynomials. Sumzo AI can help with other functions.

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