Question
Evaluating functions: Linear and quadratic or cubic The functions \( f \) and \( g \) are defined as follows. \[ f(x)=4 x+2 \quad g(x)=-2 x^{3}-5 \] Find \( f(-7) \) and \( g(-2) \). Simplify your answers as much as possible.
Ask by Simmons Mcguire. in the United States
Nov 18,2024
Real Tutor Solution
Tutor-Verified Answer
Answer
\( f(-7) = -26 \), \( g(-2) = 11 \)
Solution
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Beyond the Answer
To find \( f(-7) \), we substitute -7 into the function \( f(x) \): \[ f(-7) = 4(-7) + 2 = -28 + 2 = -26 \] Next, we calculate \( g(-2) \) by substituting -2 into the function \( g(x) \): \[ g(-2) = -2(-2)^{3} - 5 = -2(-8) - 5 = 16 - 5 = 11 \] So the final answers are: \[ f(-7) = -26 \] \[ g(-2) = 11 \]