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Popular Calculus >

integral from-1 to 1 of 2x^2-1

Solution

\int_{- 1}^{1} 2 x^{2} - 1 d x

Solution

- \frac{2}{3}

+1

Decimal

- 0.66666 \dots

Solution steps

\int_{- 1}^{1} 2 x^{2} - 1 d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int_{- 1}^{1} 2 x^{2} d x - \int_{- 1}^{1} 1 d x

\int_{- 1}^{1} 2 x^{2} d x = \frac{4}{3}

\int_{- 1}^{1} 1 d x = 2

= \frac{4}{3} - 2

Simplify

\frac{4}{3} - 2 : - \frac{2}{3}

= - \frac{2}{3}

Graph

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Frequently Asked Questions (FAQ)

What is the integral from-1 to 1 of 2x^2-1 ?
The integral from-1 to 1 of 2x^2-1 is -2/3