Solve ∫ (from - 1 to 0.73) of -1/2x^3+3x-2 wrt x

$$\int _ { - 1 } ^ { 0.73 } - \frac { 1 } { 2 } x ^ { 3 } + 3 x - 2 d x$$

Evaluate

$$-4.07114780125$$

Solution Steps

Evaluate the indefinite integral first.

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

Integrate the sum term by term.

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

Factor out the constant in each of the terms.

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

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}. Multiply -\frac{1}{2} times \frac{x^{4}}{4}.

$$-\frac{x^{4}}{8}+3\int x\mathrm{d}x+\int -2\mathrm{d}x$$

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}. Multiply 3 times \frac{x^{2}}{2}.

$$-\frac{x^{4}}{8}+\frac{3x^{2}}{2}+\int -2\mathrm{d}x$$

Find the integral of -2 using the table of common integrals rule \int a\mathrm{d}x=ax.

$$-\frac{x^{4}}{8}+\frac{3x^{2}}{2}-2x$$

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.

$$-\frac{0.73^{4}}{8}+\frac{3}{2}\times 0.73^{2}-2\times 0.73-\left(-\frac{\left(-1\right)^{4}}{8}+\frac{3}{2}\left(-1\right)^{2}-2\left(-1\right)\right)$$

Simplify.

$$-\frac{3256918241}{800000000}$$