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1.Relation and Function
easy
જો $f:IR \to IR$ માટે $f(x) = 3x - 4$ રીતે વ્યખ્યાયિત હોય તો ${f^{ - 1}}:IR \to IR$ મેળવો.
A
$4 - 3x$
B
$\frac{{x + 4}}{3}$
C
$\frac{1}{{3x - 4}}$
D
$\frac{3}{{x + 4}}$
Solution
(b) Given $f(x) = 3x – 4$.
Now let $y = {f^{ – 1}}(x)\,\, \Rightarrow \,\,f(y) = x$
$ \Rightarrow \,\,3y – 4 = x\,\, \Rightarrow \,\,3y = x + 4$
$ \Rightarrow \,\,y = \frac{{x + 4}}{3}\,\, $
$\Rightarrow \,\,{f^{ – 1}}(x) = \frac{{x + 4}}{3}$.
Standard 12
Mathematics
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