Evaluate each function: f(x) = -8x - 9 ; find f(-3)

To evaluate the function \( f(x) = -8x - 9 \) at \( x = -3 \), substitute \(-3\) for \(x\) in the function:

\[
f(-3) = -8(-3) - 9
\]

Now, calculate step by step:

\[
f(-3) = 24 - 9 = 15
\]

So, \( f(-3) = 15 \).

Would you like more details, or do you have any questions?

Here are some related questions for further practice:

1. Evaluate \( f(2) \) for the same function \( f(x) = -8x - 9 \).
2. Find the value of \( f(0) \).
3. If \( f(x) = -8x - 9 \), what value of \( x \) makes \( f(x) = 0 \)?
4. Evaluate the derivative of \( f(x) = -8x - 9 \).
5. If \( g(x) = 5x + 4 \), find \( f(g(1)) \).

**Tip:** Always substitute the given value carefully to avoid sign errors when evaluating functions.

Learn how to evaluate the function f(x) = -8x - 9 at x = -3 with a step-by-step solution. This problem involves substituting the value of x into a linear function to find the corresponding output. Suitable for Grades 7-9.

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