Questions: What is the correct graph for the exponential function?
f(x)=-3(1 / 4)^(x-3)+2
Transcript text: What is the correct graph for the exponential function?
\[
f(x)=-3(1 / 4)^{x-3}+2
\]
Solution
Solution Steps
Step 1: Analyze the function
The function is f(x) = -3(1/4)^(x-3) + 2. This is an exponential function with a base of 1/4 (meaning it's decaying), a vertical reflection due to the -3, a horizontal shift 3 units to the right, and a vertical shift 2 units up.
Step 2: Identify key features
Horizontal Asymptote: y = 2 (due to the vertical shift).
y-intercept: Calculate f(0) = -3(1/4)^(-3) + 2 = -3 * 4^3 + 2 = -192 + 2 = -190. The y-intercept is very low.
General Shape: Because of the negative coefficient, the graph will be below the asymptote. It will approach the asymptote as x increases and decrease rapidly as x decreases.
Step 3: Compare to the graphs
Only graph 'b' has a horizontal asymptote around y=2 and reflects the other described properties. Graph 'a' has an asymptote close to y=0 and isn't reflected across a horizontal axis.