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Expressing any Function using the Notation f(x)

Find f17 for ...

Question

Find f(17) for the function y = 7x - 2.

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Solution

The given function is $y = 7 x - 2.$
Here, $y$ is dependent only on $x .$
$∴ y$ is a function of $x .$
$\Rightarrow y = f (x)$

$f (17)$ represents the value of $y$ at $x = 17.$
$∴ f (17) = 7 (17) - 2 = 117$

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