\(\int_{-1}^2|x| d x=\)

\(\int_{-1}^2|x| d x=\)
  1. 1
  2. 2
  3. \(\frac{5}{2}\)
  4. \(\frac{3}{2}\)

Solution

\(\begin{aligned} I & =\int_{-1}^2|x| d x=\int_{-1}^0(-x) d x+\int_0^2(x) d x \\ & =\left[\frac{-x^2}{2}\right]_{-1}^0+\left[\frac{x^2}{2}\right]_0^2=\left(0+\frac{1}{2}\right)+\left(\frac{4}{2}-0\right)=\frac{5}{2} \end{aligned}\)

Asked in: AP EAMCET 2020 (18 Sep Shift 1)

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