By using the properties of definite integrals,evaluate the integral $\int_{-5}^{5}|x+2| d x$.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
Let $I = \int_{-5}^{5}|x+2| d x$.
It can be seen that $(x+2) \leq 0$ on $[-5, -2]$ and $(x+2) \geq 0$ on $[-2, 5]$.
Using the property $\int_{a}^{b} f(x) d x = \int_{a}^{c} f(x) d x + \int_{c}^{b} f(x) d x$,we have:
$I = \int_{-5}^{-2} -(x+2) d x + \int_{-2}^{5} (x+2) d x$
$I = -\left[\frac{x^{2}}{2} + 2x\right]_{-5}^{-2} + \left[\frac{x^{2}}{2} + 2x\right]_{-2}^{5}$
$I = -\left[\left(\frac{(-2)^{2}}{2} + 2(-2)\right) - \left(\frac{(-5)^{2}}{2} + 2(-5)\right)\right] + \left[\left(\frac{5^{2}}{2} + 2(5)\right) - \left(\frac{(-2)^{2}}{2} + 2(-2)\right)\right]$
$I = -\left[(2 - 4) - (12.5 - 10)\right] + \left[(12.5 + 10) - (2 - 4)\right]$
$I = -[-2 - 2.5] + [22.5 - (-2)]$
$I = -[-4.5] + [24.5]$
$I = 4.5 + 24.5 = 29$.

Explore More

Similar Questions

$\int_0^{2\pi } {\frac{{\sin 2\theta }}{{a - b\cos \theta }}\,d\theta = } $

The value of $\int_{-\pi / 2}^{\pi / 2} \frac{\cos x}{1+e^{x}} d x$ is

The value of $\int_{-\pi/2}^{\pi/2} (3\sin x + \sin^3 x) \, dx$ is

$\int_0^{\frac{\pi}{4}} \frac{\cos ^2 x}{\cos ^2 x+4 \sin ^2 x} d x=$

Let $I_1 = \int\limits_0^{\frac{\pi }{2}} {{e^{ - {x^2}}}\sin (x)dx} $,$I_2 = \int\limits_0^{\frac{\pi }{2}} {{e^{ - {x^2}}}dx} $,and $I_3 = \int\limits_0^{\frac{\pi }{2}} {{e^{ - {x^2}}}(1 + x)\,dx} $. Consider the following statements:
$I: I_1 < I_2$
$II: I_2 < I_3$
$III: I_1 = I_3$
Which of the following is (are) true?

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo