Question

Use the following function rule to find f(3).
f(x) =4^x -5
F(3) =

Answer 1

Answer:

59

Step-by-step explanation:

To find f(3), substitute 3 for x:

$f(3)=4^3-5\\f(3)=64-5\\f(3)=59$

Answer 2

Answer:

$f(3)=59$

Step-by-step explanation:

If $f(x)=4^x-5$

then $f(3)=4^3-5$ (substitute x = 3 into the function)

$\implies f(3)=64-5$

$\implies f(3)=59$