If $f (x) = x^{2} - 4$ , find $f (4)$ .

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Solution

Given that:

$f (x) = x^{2} - 4$
To find:
$f (4) = ?$

Solution:
$f (x) = x^{2} - 4$
or, $f (4) = 4^{2} - 4$

or, $f (4) = 16 - 4$

or, $f (4) = 12$

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