Question
The functions \( f \) and \( g \) are defined as follows. \[ f(x)=5 x-3 \quad g(x)=4 x^{2}-x \] Find \( f(-5) \) and \( g(-2) \), Simplify your answers as much as possible. \[ f(-5)=\square \]
Ask by Kelley Bob. in the United States
Mar 10,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
\( f(-5) = -28 \) and \( g(-2) = 18 \).
Solution
1. Evaluate \( f(-5) \):
- Substitute \( x = -5 \) into \( f(x) = 5x - 3 \):
\[
f(-5) = 5(-5) - 3
\]
- Multiply:
\[
5(-5) = -25
\]
- Subtract 3:
\[
f(-5) = -25 - 3 = -28
\]
2. Evaluate \( g(-2) \):
- Substitute \( x = -2 \) into \( g(x) = 4x^2 - x \):
\[
g(-2) = 4(-2)^2 - (-2)
\]
- Square \(-2\):
\[
(-2)^2 = 4
\]
- Multiply:
\[
4 \times 4 = 16
\]
- Note that subtracting \(-2\) is equivalent to adding 2:
\[
g(-2) = 16 + 2 = 18
\]
Thus, the simplified answers are:
\[
f(-5) = -28 \quad \text{and} \quad g(-2) = 18
\]
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Extra Insights
To find \( f(-5) \), we substitute \(-5\) into the function \( f(x) = 5x - 3 \): \[ f(-5) = 5(-5) - 3 = -25 - 3 = -28. \] Now, let's find \( g(-2) \) by substituting \(-2\) into the function \( g(x) = 4x^2 - x \): \[ g(-2) = 4(-2)^2 - (-2) = 4(4) + 2 = 16 + 2 = 18. \] So, we have: \[ f(-5) = -28 \] and \[ g(-2) = 18. \]