If $f (x) = - 2 x + 5$ , what is $f (- 3 x)$ equal to?

- 6 x - 5

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6 x + 5

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6 x - 5

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6 x^{2} - 15 x

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Solution

The correct option is B $6 x + 5$
Given, $f (x) = - 2 x + 5$
$\Rightarrow f (- 3 x) = - 2 (- 3 x) + 5$
$\Rightarrow f (- 3 x) = 6 x + 5$

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