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Use the following function rule to find $f(3)$ . $\newline$ $f(x) = 8^x + 9$ $\newline$ $f(3) =$ _____

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Evaluate exponential functions

Full solution

Q. Use the following function rule to find

f(3)

.

\newline

f(x) = 8^x + 9

\newline

f(3) =

_____

Identify Function: Identify the function which represents $f(3)$ . $\newline$ Substitute in $3$ for $x$ in $f(x) = 8^x + 9$ . $\newline$ $f(3) = 8^3 + 9$
Substitute in $3$ : Evaluate $8^3$ . $\newline$ $8^3$ $\newline$ = $8 \times 8 \times 8$ $\newline$ = $64 \times 8$ $\newline$ = $512$
Evaluate $8^3$ : $f(3) = 512 + 9$ $\newline$ Determine the value of $f(3)$ . $\newline$ $f(3) = 512 + 9$ $\newline$ $f(3) = 521$

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