Solve ∫ (from 2 to 3) of x^2+4 wrt x

$$\int _ { 2 } ^ { 3 } x ^ { 2 } + 4 d x$$

Evaluate

$$\frac{31}{3}\approx 10.333333333$$

Solution Steps

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.

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

Simplify.

$$\frac{31}{3}$$