Math Problem Statement

Sketch a graph of f(x) = -2|x + 1| + 4.

Solution

The given function is f(x)=2x+1+4f(x) = -2|x + 1| + 4, which involves the absolute value function.

Steps to sketch the graph:

  1. Basic Shape of Absolute Value Function:

    • The base function is x+1|x + 1|, which is a V-shaped graph centered at x=1x = -1, as the vertex of x+1|x + 1| occurs where the expression inside the absolute value is zero (x=1x = -1).
  2. Reflection and Stretch:

    • The coefficient 2-2 reflects the graph across the x-axis (flipping it upside down) and stretches it vertically by a factor of 2. This makes the "V" sharper and inverted.
  3. Vertical Shift:

    • The +4+4 shifts the entire graph upwards by 4 units, moving the vertex of the graph to (1,4)(-1, 4).

Key Points:

  • Vertex: The vertex of the graph is at (1,4)(-1, 4).
  • Slope: The slope of the left side of the graph (for x<1x < -1) is 22, and the slope of the right side (for x>1x > -1) is 2-2, due to the negative reflection.

Sketch:

The graph forms a V-shape:

  • It starts at (1,4)(-1, 4).
  • To the left of x=1x = -1, it decreases with a slope of 22.
  • To the right of x=1x = -1, it decreases with a slope of 2-2 (due to reflection).

Would you like to see a detailed plot of the graph, or do you have any further questions?

Related Questions:

  1. How do you find the vertex of an absolute value function?
  2. What happens to the graph when the coefficient of x+1|x + 1| changes from 22 to 2-2?
  3. How do you determine the domain and range of f(x)=2x+1+4f(x) = -2|x + 1| + 4?
  4. What effect does a vertical shift have on the graph of a function?
  5. How can you derive the equation of an absolute value graph from its vertex?

Tip: Always start by identifying the vertex of an absolute value function, as it determines the basic shape and position of the graph.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Functions
Transformations
Algebra

Formulas

f(x) = a|x - h| + k

Theorems

Reflection across the x-axis
Vertical translation

Suitable Grade Level

Grades 9-11