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Definition of Functions

The value of ...

Question

The value of $f (4)$ when $f (x) = x^{2} - 2 x$ is

A

8

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B

7

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C

13

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D

12

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Solution

The correct option is A 8
The given function is $f (x) = x^{2} - 2 x$
The value of function at $x = 4$ is given as $f (4) = 4^{2} - 2 (4) f (4) = 16 - 8 = 8$

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