Solve ∫ (from 0 to 1) of (2x+2-1-2x^2-2x^2+x) wrt x

$$\int_{ 0 }^{ 1 } (2x+2-1-2 { x }^{ 2 } -2 { x }^{ 2 } +x) d x$$

Evaluate

$$\frac{7}{6}\approx 1.166666667$$

Solution Steps

Evaluate the indefinite integral first.

$$\int 2x+2-1-2x^{2}-2x^{2}+x\mathrm{d}x$$

Integrate the sum term by term.

$$\int 2x\mathrm{d}x+\int 2\mathrm{d}x+\int -1\mathrm{d}x+\int -2x^{2}\mathrm{d}x+\int -2x^{2}\mathrm{d}x+\int x\mathrm{d}x$$

Factor out the constant in each of the terms.

$$2\int x\mathrm{d}x+\int 2\mathrm{d}x+\int -1\mathrm{d}x-2\int x^{2}\mathrm{d}x-2\int x^{2}\mathrm{d}x+\int x\mathrm{d}x$$

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

$$x^{2}+\int 2\mathrm{d}x+\int -1\mathrm{d}x-2\int x^{2}\mathrm{d}x-2\int x^{2}\mathrm{d}x+\int x\mathrm{d}x$$

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

$$x^{2}+2x+\int -1\mathrm{d}x-2\int x^{2}\mathrm{d}x-2\int x^{2}\mathrm{d}x+\int x\mathrm{d}x$$

Find the integral of -1 using the table of common integrals rule \int a\mathrm{d}x=ax.

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

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

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

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

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

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}.

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

Simplify.

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

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.

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

Simplify.

$$\frac{7}{6}$$