Math Problem Statement

Below are the graphs of f(x) = (x - 4)^2 - 9 and a straight line g. A and B are the x-intercepts of f and E is the turning point of f. C is the y-intercept of both f and g. The x-intercept of g is D. DB is parallel to the y-axis. Questions: 4.1 Write down the coordinates of E. 4.2 Calculate the coordinates of A. 4.3 M is the reflection of C in the axis of symmetry of f. Write down the coordinates of M. 4.4 Determine the equation of g in the form y = mx + c. 4.5 Write down the equation of g^{-1} in the form y = ... 4.6 For which values of x will |g(f(x))| ≤ 0?

Solution

This question involves analyzing the graphs of two functions and finding various properties of them. Let's break down the questions based on the graph and the function given.

Question Breakdown:

  1. Coordinates of E (4.1):

    • Point E is the y-intercept of both the parabola f(x)=(x4)29f(x) = (x - 4)^2 - 9 and the line gg.
    • To find the coordinates of E, we'll need to substitute x=0x = 0 into the equation of f(x)f(x) to find the y-coordinate. The x-coordinate will be 00 because it's the y-intercept.
  2. Coordinates of A (4.2):

    • A is the x-intercept of the function f(x)f(x), which means we set f(x)=0f(x) = 0 and solve for xx.
  3. Reflection of C in the axis of symmetry (4.3):

    • The point M is the reflection of C in the axis of symmetry of the parabola. The axis of symmetry of f(x)f(x) is the vertical line passing through the vertex of the parabola, i.e., x=4x = 4. To find M, we'll reflect the coordinates of C across this axis.
  4. Equation of line g (4.4):

    • From the graph, we can see that line gg is a straight line with a slope mm and y-intercept cc. We can find the equation by determining these two values from the graph.
  5. Equation of the inverse of g (4.5):

    • Once we have the equation of line gg, the inverse g1g^{-1} can be found by swapping the roles of xx and yy, and solving for yy.
  6. For which values of xx will g(f(x))0|g(f(x))| \leq 0 (4.6):

    • This asks for the values of xx where the composition g(f(x))g(f(x)) is less than or equal to 0. This will involve substituting f(x)f(x) into g(x)g(x), solving for the x-values where the result is less than or equal to 0.

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Math Problem Analysis

Mathematical Concepts

Functions
Quadratic Equations
Linear Functions
Reflection
Inverse Functions
Function Composition

Formulas

y = mx + c
g(f(x))
Reflection across axis of symmetry

Theorems

Symmetry of quadratic functions
Properties of inverse functions
Linear function properties

Suitable Grade Level

Grades 10-12