Question

Show that:
$integral subscript 0 superscript 1 open vertical bar 3 straight x minus 1 close vertical bar space dx space equals space 5 over 6$

Solution

Let I = $integral subscript 0 superscript 1 open vertical bar 3 straight x minus 1 close vertical bar space dx$
For $0 less or equal than straight x less or equal than 1 third comma space space space 3 straight x minus 1 less or equal than 0 space space space space rightwards double arrow space space space space open vertical bar 3 straight x minus 1 close vertical bar space equals space minus left parenthesis 3 straight x minus 1 right parenthesis$
and for $1 third less or equal than straight x less or equal than 1 comma space space 3 straight x minus 1 greater or equal than 0 space space space space space rightwards double arrow space space open vertical bar 3 straight x minus 1 close vertical bar space equals space 3 straight x minus 1$
$therefore space space space straight I space equals space integral subscript 0 superscript 1 third end superscript open vertical bar 3 straight x minus 1 close vertical bar dx plus integral subscript 1 third end subscript superscript 1 open vertical bar 3 straight x minus 1 close vertical bar dx space equals space minus integral subscript 0 superscript 1 third end superscript left parenthesis 3 straight x minus 1 right parenthesis dx plus integral subscript 1 third end subscript superscript 1 left parenthesis 3 straight x minus 1 right parenthesis space dx$
$equals negative open square brackets 3 over 2 straight x squared minus straight x close square brackets subscript 0 superscript 1 third end superscript space plus space open square brackets 3 over 2 straight x squared minus straight x close square brackets subscript 1 third end subscript superscript 1 equals negative open square brackets open parentheses 1 over 6 minus 1 third close parentheses minus 0 close square brackets space plus space open square brackets open parentheses 3 over 2 minus 1 close parentheses minus open parentheses 1 over 6 minus 1 third close parentheses close square brackets space equals space 1 over 6 plus 1 half plus 1 over 6 equals 5 over 6.$

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Integrals

Show that:
$integral subscript 0 superscript 1 open vertical bar 3 straight x minus 1 close vertical bar space dx space equals space 5 over 6$

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