MCQ
$\int\limits_a^b {{\mathop{\rm sgn}} \,x} \,\,dx$ $=$ (where $a, b \in R$)
  • A
    $| b | - | a |$
  • B
    $(b-a)\, sgn\, (b-a)$
  • C
    $b\, sgnb - a\, sgna$
  • Both $(A)$ and $(C)$

Answer

Correct option: D.
Both $(A)$ and $(C)$
d
$I=\int_{a}^{b} \operatorname{sgn}(x) d x$

$a<0$     $b>0$

$I=\int_{a}^{b} \int \operatorname{sgn}(x) d x= \int_{a}^{0}(-1) d x+\int_{0}^{b}(1) d x$

$\geqslant-[x]_{a}^{0}+[x]_{0}^{b}$

$>-(0-a)+(b-0)$

$x a^{0}+b$

If $a \cdot \operatorname{sgn}(a)+b \operatorname{sgn}(b)$

$a>0, \quad b>0$

$I=\int_{a}^{b} 1 d x=[x]_{a}^{b}=b-a$

$\int_{a}^{b} \operatorname{sgn}(x) d x=|b|-|a|$

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