Solve ∫ (from 0 to 2) of (x+4) wrt x

$$\int _ { 0 } ^ { 2 } ( x + 4 ) d x$$

Evaluate

$$10$$

Solution Steps

Evaluate the indefinite integral first.

$$\int x+4\mathrm{d}x$$

Integrate the sum term by term.

$$\int x\mathrm{d}x+\int 4\mathrm{d}x$$

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

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

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

$$\frac{x^{2}}{2}+4x$$

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.

$$\frac{2^{2}}{2}+4\times 2-\left(\frac{0^{2}}{2}+4\times 0\right)$$

Simplify.

$$10$$