Math Problem Statement

Choose all the transformations applied to get from f(x) = log3(x) to g(x) = -(1/4)log3(5(x-7)) + 3.

Solution

Let's analyze the given transformation problem step by step.

We are comparing f(x)=log3(x)f(x) = \log_3(x) and g(x)=14log3(5(x7))+3g(x) = -\frac{1}{4} \log_3(5(x-7)) + 3. From this, we can deduce the transformations applied:

1. Vertical compression by a factor of 14\frac{1}{4}:

  • The coefficient 14-\frac{1}{4} outside the logarithm indicates a vertical compression by 14\frac{1}{4}.

2. Reflection across the x-axis:

  • The negative sign in 14-\frac{1}{4} causes the graph to reflect across the x-axis.

3. Horizontal compression by a factor of 15\frac{1}{5}:

  • Inside the logarithmic function, the 5(x7)5(x-7) term indicates a horizontal compression by a factor of 15\frac{1}{5}, as the multiplier is reciprocal for horizontal transformations.

4. Translation 7 units to the right:

  • The x7x-7 inside the logarithmic function translates the graph 7 units to the right.

5. Translation 3 units up:

  • The +3+3 outside the logarithmic function translates the graph 3 units upward.

Correct transformations:

  • Vertical compression of 14\frac{1}{4} and horizontal compression of 15\frac{1}{5}.
  • Reflection across the x-axis.
  • Translation 7 units right and 3 units up.

Would you like me to explain any of these transformations further or provide visual examples?

Follow-up Questions:

  1. How do reflections affect the orientation of the graph?
  2. Why do coefficients outside and inside logarithmic functions affect vertical and horizontal transformations differently?
  3. What happens if we translate the graph to the left instead of the right?
  4. Can this transformation sequence be applied to a different base logarithmic function (e.g., log2(x)\log_2(x))?
  5. What if +3+3 were replaced with 3-3? How would the transformation differ?

Tip:

Always apply transformations in the order of reflections, stretches/compressions, and then translations for consistency.

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Math Problem Analysis

Mathematical Concepts

Logarithmic Functions
Transformations of Functions

Formulas

Transformation of logarithmic functions: a*logb(c(x-d))+k

Theorems

Transformation Properties of Logarithmic Functions

Suitable Grade Level

Grades 10-12