Math Problem Statement

Compare g(x) = 12 |x + 3| − 1 to the graph of f.

Solution

To compare the graph of g(x)=12x+31g(x) = 12|x + 3| - 1 to the graph of f(x)=xf(x) = |x|, we'll break down the transformations step by step.

1. Starting Function f(x)=xf(x) = |x|

  • This is the basic absolute value function, which has a "V" shape centered at the origin (0,0)(0, 0), opening upwards.

2. Horizontal Shift

  • The function g(x)=x+3g(x) = |x + 3| indicates a horizontal shift of f(x)f(x) by 3 units to the left. This is because the expression inside the absolute value, x+3x + 3, means that every xx value is effectively reduced by 3 before applying the absolute value.

3. Vertical Stretch

  • The function g(x)=12x+3g(x) = 12|x + 3| introduces a vertical stretch by a factor of 12. This makes the "V" shape of the graph steeper. Every y-value of x+3|x + 3| is multiplied by 12, stretching the graph vertically.

4. Vertical Shift

  • Finally, g(x)=12x+31g(x) = 12|x + 3| - 1 involves a vertical shift downwards by 1 unit. This means the entire graph is moved down by 1 unit.

Summary of Transformations:

  • Start with f(x)=xf(x) = |x|.
  • Shift the graph 3 units to the left.
  • Apply a vertical stretch by a factor of 12.
  • Move the graph 1 unit downwards.

Visual Comparison:

  • f(x)=xf(x) = |x|: "V" shape centered at (0,0)(0,0).
  • g(x)=12x+31g(x) = 12|x + 3| - 1: Much steeper "V" shape centered at (3,1)(-3,-1).

Key Points:

  • The vertex of g(x)g(x) is at (3,1)(-3, -1).
  • The graph is 12 times steeper than f(x)f(x).

Would you like to see the graphs or need any further details?

Here are 5 related questions:

  1. How would the graph change if the coefficient 12 were different?
  2. What happens to the graph if we shift f(x)=xf(x) = |x| by 3 units to the right instead?
  3. How do you determine the vertex of a transformed absolute value function?
  4. What effect does multiplying by a negative number have on the graph?
  5. How would the graph look if we added a vertical stretch instead of compression?

Tip: Remember, horizontal shifts inside the function's argument x+h|x + h| always move the graph in the opposite direction of the sign.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Functions
Function Transformations

Formulas

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

Theorems

Transformation Theorems for Graphs

Suitable Grade Level

Grades 9-11