How do you evaluate the function $f(x)=6x$ when x=3?

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Answer 1 · 2017-11-20T19:52:31

Substitute $color(red)(3)$ for $color(red)(x)$ in $f(x)$ and calculate the result:

$f(color(red)(x)) = 6color(red)(x)$ becomes:

$f(color(red)(3)) = 6 xx color(red)(3)$

$f(color(red)(3)) = 18$

How do you evaluate the function f(x)=6xf(x)=6x when x=3?