حل ∫ (from - 1 to 0) of (x^3-2x^2-13x)

$$\int _ { - 1 } ^ { 0 } ( x ^ { 3 } - 2 x ^ { 2 } - 13 x )$$

تقدير القيمة

$$\frac{67}{12}\approx 5.583333333$$

خطوات الحل

Evaluate the indefinite integral first.

$$\int x^{3}-2x^{2}-13x\mathrm{d}x$$

Integrate the sum term by term.

$$\int x^{3}\mathrm{d}x+\int -2x^{2}\mathrm{d}x+\int -13x\mathrm{d}x$$

Factor out the constant in each of the terms.

$$\int x^{3}\mathrm{d}x-2\int x^{2}\mathrm{d}x-13\int x\mathrm{d}x$$

Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int x^{3}\mathrm{d}x with \frac{x^{4}}{4}.

$$\frac{x^{4}}{4}-2\int x^{2}\mathrm{d}x-13\int x\mathrm{d}x$$

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}. اضرب -2 في \frac{x^{3}}{3}.

$$\frac{x^{4}}{4}-\frac{2x^{3}}{3}-13\int x\mathrm{d}x$$

Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int x\mathrm{d}x with \frac{x^{2}}{2}. اضرب -13 في \frac{x^{2}}{2}.

$$\frac{x^{4}}{4}-\frac{2x^{3}}{3}-\frac{13x^{2}}{2}$$

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.

$$\frac{0^{4}}{4}-\frac{2}{3}\times 0^{3}-\frac{13}{2}\times 0^{2}-\left(\frac{\left(-1\right)^{4}}{4}-\frac{2}{3}\left(-1\right)^{3}-\frac{13}{2}\left(-1\right)^{2}\right)$$

تبسيط.

$$\frac{67}{12}$$