How do you find $f(-4)$ when $f(x)=8x+11$ ?

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Answer 1 · 2017-03-04T02:18:33

See the entire solution process below:

To find $f(-4)$ , substitute $color(red)(-4)$ for every occurrence of $color(red)(x)$ in the function $f(x)$ :

$f(color(red)(x)) = 8color(red)(x) + 11$ becomes:

$f(color(red)(-4)) = (8 xx color(red)(-4)) + 11$

$f(color(red)(-4)) = -32 + 11$

$f(color(red)(-4)) = -21$

How do you find f(-4)f(-4) when f(x)=8x+11f(x)=8x+11?