Math Problem Statement

The graph of the function f(x) = x^2 is given below. Below is a graph of g(x), a linear transformation of f. What is the expression for g(x)?

Solution

We are given two graphs:

  1. The first graph is of the function f(x)=x2f(x) = x^2, a standard parabola with vertex at the origin (0, 0) and symmetry around the y-axis.

  2. The second graph is of the function g(x)g(x), which is described as a linear transformation of f(x)f(x). The graph looks like it has been reflected and scaled.

From observation, the second graph appears to be reflected across the x-axis and vertically stretched. The general form for a linear transformation of a quadratic function f(x)f(x) is: g(x)=af(x)+bg(x) = a f(x) + b For reflections and vertical scaling, we typically have the form g(x)=af(x)g(x) = -a f(x). Here, f(x)=x2f(x) = x^2, so: g(x)=ax2g(x) = -a x^2 Looking at the graph, the vertex is still at (0,0)(0, 0), so there is no vertical shift. The graph opens downward, indicating that aa is negative.

From the stretch, it appears that a=1a = 1, so: g(x)=x2g(x) = -x^2

Thus, the equation of the second graph is g(x)=x2g(x) = -x^2.

Would you like more details or have any questions? Here are 5 related questions to explore:

  1. How does the coefficient aa in g(x)=af(x)g(x) = a f(x) affect the graph?
  2. What is the effect of reflecting a graph over the x-axis?
  3. How do you recognize vertical shifts and stretches in a graph?
  4. What are the general steps to find a transformation equation from a graph?
  5. What other types of transformations could apply to quadratic functions?

Tip: When identifying transformations, always check for reflections, stretches, shifts, and dilations by comparing key points like the vertex and intercepts.

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Math Problem Analysis

Mathematical Concepts

Linear Transformations
Quadratic Functions
Reflections
Graph Transformations

Formulas

g(x) = a f(x) + b
f(x) = x^2
g(x) = -a f(x)

Theorems

Transformation of Functions Theorem

Suitable Grade Level

Grades 9-12