If f(x)=4[x]-3, where [x] is greatest integer function of x, then… - Vidyadip

Question

If $f(x)=4[x]-3$, where $[x]$ is greatest integer function of $x$, then find$f(7.2)$

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Answer

$ f(x)=4[x]-3$
$f(7.2)=4[7.2]-3$
$=4(7)-3 \ldots \ldots . .[\because 47.2<8,[7.2]=7]$
$=25 $

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