Υπολογιστής Ορισμένου και Ακατάλληλου Ολοκληρώματος

Υπολογίστε ορισμένα και ακατάλληλα ολοκληρώματα βήμα προς βήμα

Η αριθμομηχανή θα προσπαθήσει να υπολογίσει το ορισμένο (δηλ. με όρια) ολοκλήρωμα, συμπεριλαμβανομένου του ατελούς, παρουσιάζοντας τα βήματα.

Enter a function:

Integrate with respect to:

Enter a lower limit:

If you need `-oo`, type -inf.

Enter an upper limit:

If you need `oo`, type inf.

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Solution

Your input: calculate $$$\int_{-15}^{15}\left( x^{2} - 3 x \right)dx$$$

First, calculate the corresponding indefinite integral: $$$\int{\left(x^{2} - 3 x\right)d x}=\frac{x^{2} \left(2 x - 9\right)}{6}$$$ (for steps, see indefinite integral calculator)

According to the Fundamental Theorem of Calculus, $$$\int_a^b F(x) dx=f(b)-f(a)$$$, so just evaluate the integral at the endpoints, and that's the answer.

$$$\left(\frac{x^{2} \left(2 x - 9\right)}{6}\right)|_{\left(x=15\right)}=\frac{1575}{2}$$$

$$$\left(\frac{x^{2} \left(2 x - 9\right)}{6}\right)|_{\left(x=-15\right)}=- \frac{2925}{2}$$$

$$$\int_{-15}^{15}\left( x^{2} - 3 x \right)dx=\left(\frac{x^{2} \left(2 x - 9\right)}{6}\right)|_{\left(x=15\right)}-\left(\frac{x^{2} \left(2 x - 9\right)}{6}\right)|_{\left(x=-15\right)}=2250$$$

Answer: $$$\int_{-15}^{15}\left( x^{2} - 3 x \right)dx=2250$$$

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