Question

Use the following function rule to find f(4). f(x) = –2 ( 5 ) x f(4) =

Answer 1

To find \( f(4) \) using the function rule \( f(x) = -2(5)^x \), we need to substitute \( x = 4 \) into the function.

\[
f(4) = -2(5)^4
\]

Now, calculate \( 5^4 \):

\[
5^4 = 625
\]

Now substitute back into the equation:

\[
f(4) = -2 \cdot 625 = -1250
\]

So, the final answer is:

\[
f(4) = -1250
\]