# Let f(x) = 3^x-2. Find f(4) ?

## Evaluation Exponential Functions

##### 1 Answer
Oct 31, 2017

$9$... or $79$.

#### Explanation:

Should have written the question more clearly. Since we are replacing $x$ with $4$ as seen from $f \left(4\right)$, we can simply plug $4$ into ${3}^{x} - 2$ to be ${3}^{4} - 2$. This would be equal to $79$.

However, if the equation were written like this, which could be more likely:

${3}^{x - 2}$

your answer would be $9$, as the exponent would just be $2$, since you are simply taking away $2$ from $4$.