For a function $f$, the value of $f(x)$ is multiplied by 9 for every …

Question

Prompt

For a function

f

, the value of

f (x)

is multiplied by 9 for every increase of 1 in the value of

x

. When

x = 0

f (x) = 8

. Which of the following equations defines

f

f (x) = 9 (8)^{x}

f (x) = 8 x + 9

f (x) = 8 (9 x)

f (x) = 8 (9)^{x}