How to evaluate the function f(x)=9x+2 given independent value a. f(-8) b. f(x+6) c. f(-x) ?

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Answer 1 · 2018-06-09T04:26:23

Please see below.

.

$f (x) = 9 x + 2$ $f(x)=9x+2$

$a)$ $color(red)(a))$

To find $f (- 8)$ $f(-8)$ , we plug in $- 8$ $-8$ wherever we see $x$ $x$ in $f (x)$ $f(x)$ :

$f (- 8) = 9 (- 8) + 2 = - 72 + 2 = - 70$ $f(-8)=9(-8)+2=-72+2=-70$

Similarly:

$b)$ $color(red)(b))$

$f (x + 6) = 9 ((x + 6) + 2 = 9 x + 54 + 2 = 9 x + 56$ $f(x+6)=9((x+6)+2=9x+54+2=9x+56$

$c)$ $color(red)(c))$

$f (- x) = 9 (- x) + 2 = - 9 x + 2$ $f(-x)=9(-x)+2=-9x+2$