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7.2 definite integral — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMaths7.2 definite integral1 Mark
MCQ
If $f(x) = |x - 1|$, then $\int_0^2 {f(x)dx}  $ is
  • ✓
    $1$
  • B
    $0$
  • C
    $2$
  • D
    $-2$
✓

Answer

Correct option: A.
$1$
a
(a) Given $f(x) = |x - 1|$

$\therefore$  $\int_0^2 {f(x)dx = \int_0^2 {{\rm{ }}|x - 1|dx} } $

$= \int_0^1 {(1 - x)dx + \int_1^2 {(x - 1)dx} } $

$ = \left[ {x - \frac{{{x^2}}}{2}} \right]_0^1 + \left[ {\frac{{{x^2}}}{2} - x} \right]_1^2$

$ = \left( {1 - \frac{1}{2}} \right) + (2 - 2) - \left( {\frac{1}{2} - 1} \right) = 1$.

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