حل ∫ (from - 4 to 4) of x^2-4 wrt x

$$\int _ { - 4 } ^ { 4 } x ^ { 2 } - 4 d x$$

تقدير القيمة

$$\frac{32}{3}\approx 10.666666667$$

خطوات الحل

Evaluate the indefinite integral first.

$$\int x^{2}-4\mathrm{d}x$$

Integrate the sum term by term.

$$\int x^{2}\mathrm{d}x+\int -4\mathrm{d}x$$

Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int x^{2}\mathrm{d}x with \frac{x^{3}}{3}.

$$\frac{x^{3}}{3}+\int -4\mathrm{d}x$$

Find the integral of -4 using the table of common integrals rule \int a\mathrm{d}x=ax.

$$\frac{x^{3}}{3}-4x$$

The definite integral is the antiderivative of the expression evaluated at the upper limit of integration minus the antiderivative evaluated at the lower limit of integration.

$$\frac{4^{3}}{3}-4\times 4-\left(\frac{\left(-4\right)^{3}}{3}-4\left(-4\right)\right)$$

تبسيط.

$$\frac{32}{3}$$