Question

Evaluate: $integral subscript 0 superscript 1 open vertical bar 2 straight x minus 1 close vertical bar space dx.$

Solution

Let $straight I space equals space integral subscript 0 superscript 1 space open vertical bar 2 straight x minus 1 close vertical bar space dx$
For $0 less or equal than straight x less or equal than 1 half comma space space space 2 straight x minus 1 space less or equal than 0 space space space rightwards double arrow space space space open vertical bar 2 straight x minus 1 close vertical bar space equals space minus left parenthesis 2 straight x minus 1 right parenthesis$
and for $1 half less or equal than straight x less or equal than 1 comma space space 2 straight x minus 1 greater or equal than 0 space space space space rightwards double arrow space space space open vertical bar 2 straight x minus 1 close vertical bar space equals space 2 straight x minus 1$
$therefore space space space space space straight I space equals space integral subscript 0 superscript 1 half end superscript open vertical bar 2 straight x minus 1 close vertical bar space dx plus integral subscript 1 half end subscript superscript 1 open vertical bar 2 straight x minus 1 close vertical bar space dx space equals space minus integral subscript 0 superscript 1 half end superscript left parenthesis 2 straight x minus 1 right parenthesis space dx plus integral subscript 1 half end subscript superscript 1 left parenthesis 2 straight x minus 1 right parenthesis space dx$
$equals space minus open square brackets straight x squared minus straight x close square brackets subscript 0 superscript 1 half end superscript space plus space open square brackets straight x squared minus straight x close square brackets subscript 1 half end subscript superscript 1 equals negative open square brackets open parentheses 1 fourth minus 1 half close parentheses minus open parentheses 0 minus 0 close parentheses close square brackets space plus space open square brackets left parenthesis 1 minus 1 right parenthesis space minus space open parentheses 1 fourth minus 1 half close parentheses close square brackets equals space minus open parentheses 1 fourth minus 1 half close parentheses minus open parentheses 1 fourth minus 1 half close parentheses space equals space minus 2 space open parentheses 1 fourth minus 1 half close parentheses equals negative 2 open parentheses fraction numerator 1 minus 2 over denominator 4 end fraction close parentheses space equals negative 2 open parentheses negative 1 fourth close parentheses space equals space 1 half$

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Integrals

Evaluate: $integral subscript 0 superscript 1 open vertical bar 2 straight x minus 1 close vertical bar space dx.$

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