Solve ∫ (from 0 to 5) of 5x+4

$$\int _ { 0 } ^ { 5 } 5 x + 4$$

Evaluate

$$\frac{165}{2}=82.5$$

Solution Steps

Evaluate the indefinite integral first.

$$\int 5x+4\mathrm{d}x$$

Integrate the sum term by term.

$$\int 5x\mathrm{d}x+\int 4\mathrm{d}x$$

Factor out the constant in each of the terms.

$$5\int x\mathrm{d}x+\int 4\mathrm{d}x$$

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}. Multiply 5 times \frac{x^{2}}{2}.

$$\frac{5x^{2}}{2}+\int 4\mathrm{d}x$$

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

$$\frac{5x^{2}}{2}+4x$$

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.

$$\frac{5}{2}\times 5^{2}+4\times 5-\left(\frac{5}{2}\times 0^{2}+4\times 0\right)$$

Simplify.

$$\frac{165}{2}$$