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Definition of Functions

Given, fx =...

Question

Given, $f (x) = 7 x + 2$ ; find $x$ , if $f (x) = 30$ .

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Solution

Given, $f (x) = 7 x + 2$
Also $f (x) = 30$
Therefore, $7 x + 2 = 30$
$\Rightarrow 7 x = 30 - 2$
$\Rightarrow 7 x = 28$
$\Rightarrow x = 4$

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