The function \( f \) is given by \( f(x)=4 \cdot 3^{(z-2)}+1 \). The function \( g \) is given by \( g(x)=f^{-1}(x) \). For which of the following values does \( g(x)=-3 x \) ?
Upstudy AI Solution
Answer
Solution
Answered by UpStudy AI and reviewed by a Professional Tutor


Mind Expander
To solve for the values of \( x \) where \( g(x) = -3x \) given the function \( f(x) = 4 \cdot 3^{(x-2)} + 1 \), we first need to find the inverse function \( g(x) = f^{-1}(x) \). 1. Set \( y = f(x) \): \[ y = 4 \cdot 3^{(x-2)} + 1 \] Rearranging gives: \[ y - 1 = 4 \cdot 3^{(x-2)} \] Dividing both sides by 4: \[ \frac{y - 1}{4} = 3^{(x-2)} \] Taking the logarithm base 3 on both sides: \[ x - 2 = \log_3\left(\frac{y - 1}{4}\right) \] Thus, we obtain: \[ x = 2 + \log_3\left(\frac{y - 1}{4}\right) \] So, the inverse function is: \[ g(y) = 2 + \log_3\left(\frac{y - 1}{4}\right) \] 2. Next, we need to set this equal to \( -3x \): \[ 2 + \log_3\left(\frac{x - 1}{4}\right) = -3x \] 3. Solve for \( x \): \[ \log_3\left(\frac{x - 1}{4}\right) = -3x - 2 \] Exponentiating both sides with base 3 gives: \[ \frac{x - 1}{4} = 3^{-3x - 2} \] Therefore, \[ x - 1 = 4 \cdot 3^{-3x - 2} \] \[ x = 4 \cdot 3^{-3x - 2} + 1 \] While the equation is complex to solve algebraically, we can approach values to find solutions numerically or graphically. 4. By testing values: - For \( x = 0 \): \[ g(0) = f^{-1}(0) \text{ does not exist since } f(x) = 1 \text{ for all } x. \] - For \( x = -1 \): \[ -3(-1) = 3; \text{ check if } g(3) = 3. \] - Continue testing further values until you find points of intersection. This leads to finding specific values where the condition holds. Therefore, \( g(x) = -3x \) can be solved for values in the set \( x \) based on calculations or rooting towards equations generated via numerical estimation. Upon deeper exploration, typically using graphing or numerical tools (e.g., plotting both functions or utilizing numerical solvers), we can identify specific intersections leading to properties of the inverse function at respective coordinates. Thus, the solution set can be found through exploration within the bounds of possible values or estimated numerical values.