If $f (x) = 5 x - 10$ , find the value of $f (4) - f (3)$ .

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Solution

The correct option is A 5
Given, $f (x) = 5 x - 10$
$\Rightarrow f (4) = 5 (4) - 10 = 20 - 10 = 10$
$\Rightarrow f (3) = 5 (3) - 10 = 15 - 10 = 5$
$∴ f (4) - f (3) = 10 - 5 = 5$

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