iff(x)=5x+40f(x)=5x + 40f(x)=5x+40, what isf(x)f(x)f(x)whenx=–5x = –5x=–5?

To find $f(x)$ when $x = -5$, we will use the following steps:

1. Break Down the Problem

We need to evaluate the function $f(x) = 5x + 40$ at $x = -5$.

2. Relevant Concepts

The function given is a linear function and can be evaluated directly by substituting $x$ into the formula.

3. Analysis and Detail

We will substitute $x = -5$ into the function:

$f(-5) = 5(-5) + 40$

Calculating this:

$f(-5) = -25 + 40$ $f(-5) = 15$

4. Verify and Summarize

The calculation is simple and straightforward, ensuring no mistakes in substitution and arithmetic.

Final Answer

Thus, $f(-5) = 15$.