Question

By using the properties of definite integrals, evaluate the following integral:
$integral subscript 0 superscript 4 open vertical bar straight x minus 1 close vertical bar space dx$

Solution

Let I = $integral subscript 0 superscript 4 open vertical bar straight x minus 1 close vertical bar space dx$
For $0 less or equal than straight x less or equal than 1 comma space space straight x minus 1 less or equal than 0 space space space rightwards double arrow space space space open vertical bar straight x minus 1 close vertical bar space equals space minus left parenthesis straight x minus 1 right parenthesis$
and for $1 less or equal than straight x less or equal than 4 comma space space straight x minus 1 greater or equal than 0 space space space rightwards double arrow space space space open vertical bar straight x minus 1 close vertical bar space equals space straight x space minus 1$
$therefore space space space space space space straight I space equals space integral subscript 0 superscript 1 open vertical bar straight x minus 1 close vertical bar dx plus integral subscript 1 superscript 4 open vertical bar straight x minus 1 close vertical bar dx space equals space integral subscript 0 superscript 1 minus left parenthesis straight x minus 1 right parenthesis dx plus integral subscript 1 superscript 4 left parenthesis straight x minus 1 right parenthesis space dx$
$equals negative open square brackets straight x squared over 2 minus straight x close square brackets subscript 0 superscript 1 plus open square brackets straight x squared over 2 minus straight x close square brackets subscript 1 superscript 4 space equals space minus open square brackets open parentheses 1 half minus 1 close parentheses minus left parenthesis 0 minus 0 right parenthesis close square brackets space plus space open square brackets open parentheses 16 over 2 minus 4 close parentheses minus open parentheses 1 half minus 1 close parentheses close square brackets equals space minus open parentheses 1 half close parentheses plus open parentheses 4 plus 1 half close parentheses space equals space 5$

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Integrals

By using the properties of definite integrals, evaluate the following integral:
$integral subscript 0 superscript 4 open vertical bar straight x minus 1 close vertical bar space dx$

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