The function g(x) is a transformation of f(x). If g(x) has a y-intercept of -2, which of the following functions could represent g(x)? A. g(x) = f(x + 2) B. g(x) = f(x - 5) C. g... The function g(x) is a transformation of f(x). If g(x) has a y-intercept of -2, which of the following functions could represent g(x)? A. g(x) = f(x + 2) B. g(x) = f(x - 5) C. g(x) = f(x) - 5 D. g(x) = f(x) - 2
Understand the Problem
The question provides a graph of a function f(x) and asks which transformation of f(x) results in a new function g(x) with a y-intercept of -2. We need to analyze the given options to determine which one shifts the graph of f(x) vertically such that the y-intercept becomes -2.
Answer
$f(x) - 2$
Answer for screen readers
$f(x) - 2$
Steps to Solve
- Identify the y-intercept of the original function f(x)
From the graph (which is not provided, but we can assume its y-intercept), let's denote the y-intercept of $f(x)$ as $y_0$.
- Analyze option A: $f(x) - 2$
This transformation shifts the graph of $f(x)$ downward by 2 units. The new y-intercept will be $y_0 - 2$. We want this to be -2, so we need to check if $y_0 - 2 = -2$. This implies $y_0 = 0$.
- Analyze option B: $f(x) + 2$
This transformation shifts the graph of $f(x)$ upward by 2 units. The new y-intercept will be $y_0 + 2$. We want this to be -2, so we need to check if $y_0 + 2 = -2$. This implies $y_0 = -4$.
- Analyze option C: $2f(x)$
This transformation scales the graph of $f(x)$ vertically by a factor of 2. The new y-intercept will be $2y_0$. We want this to be -2, so we need to check if $2y_0 = -2$. This implies $y_0 = -1$.
- Analyze option D: $-2f(x)$
This transformation scales the graph of $f(x)$ vertically by a factor of -2. The new y-intercept will be $-2y_0$. We want this to be -2, so we need to check if $-2y_0 = -2$. This implies $y_0 = 1$.
- Need to infer $y_0$ from the context
Since the graph is not provided, we need to determine which of the inferred values of $y_0$ is the most plausible one given the problem context (which is missing).
Let's assume that the y-intercept of the original graph of f(x) is at $y_0 = 0$. Then option A ($f(x) - 2$) would shift the graph down 2 units, resulting in a y-intercept of -2.
$f(x) - 2$
More Information
The transformation $f(x) - 2$ shifts the entire graph of $f(x)$ downwards by 2 units. Therefore, if the original y-intercept of $f(x)$ was 0, the new y-intercept of $f(x) - 2$ will be -2.
Tips
A common mistake is misunderstanding the effect of different transformations on the graph of a function. For example, $f(x) + c$ shifts the graph upwards by $c$ units, while $f(x) - c$ shifts it downwards by $c$ units. Also, $cf(x)$ scales the graph vertically by a factor of $c$.
AI-generated content may contain errors. Please verify critical information