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Theorems for Continuity

If fx = 3x ...

Question

If $f (x) = 3 x - 7$ , then what is the value of $3 f (3)$

A

6

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B

5

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C

4

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D

8

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Solution

The correct option is A $6$
Given,
$f (x) = 3 x - 7$
$3 f (x) = 3 (3 x - 7)$
Putting $x = 3$
$f (3) = 3 \times 3 - 7$
$= 9 - 7 = 2$
So we get, $f (3)$ $= 2$
$3 f (3) = 3 \times 2 = 6$

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