If $f (x) = 2 x - 5$ , then what is the value of $f (2) + f (5)$ ?

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Solution

We have $f (x) = 2 x - 5$

To find $f (2) + f (5)$

Put $x = 2$ in $f (x) = 2 x - 5$ , we get

$f (2) = 2 (2) - 5 = 4 - 5 = - 1$

Put $x = 5$ in $f (x) = 2 x - 5$ , we get

$f (5) = 2 (5) - 5 = 10 - 5 = 5$

Thus $f (2) + f (5) = - 1 + 5 = 4$

Hence $f (2) + f (5) = 4$

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