Math Problem Statement

y = sec(x) and the point (3,2) are shown. Graph y= - sec(3x) and the transformation of the point.

Solution

The graph of y=sec(3x)y = -\sec(3x) is a transformation of the graph of y=sec(x)y = \sec(x). We can break this transformation into two main steps:

  1. Horizontal compression: The factor of 33 inside the secant function compresses the graph horizontally by a factor of 13\frac{1}{3}. This affects the period of the secant function, reducing it from 2π2\pi (for y=sec(x)y = \sec(x)) to 2π3\frac{2\pi}{3} (for y=sec(3x)y = \sec(3x)).

  2. Vertical reflection: The negative sign in front of the secant function reflects the graph over the x-axis.

Transformation of the Point (3,2)(3, 2):

To find the transformed point from (3,2)(3, 2) on the graph of y=sec(3x)y = -\sec(3x), we apply the same transformations to the x and y coordinates.

  • Horizontal compression: The x-coordinate is compressed by a factor of 13\frac{1}{3}. Therefore, x=3x = 3 becomes: x=33=1x' = \frac{3}{3} = 1

  • Vertical reflection: The y-coordinate is reflected across the x-axis, so y=2y = 2 becomes: y=2y' = -2

Thus, the transformed point is (1,2)(1, -2).

Final Transformed Graph

The graph of y=sec(3x)y = -\sec(3x) will appear as a compressed and flipped version of the original secant graph. The transformed point is (1,2)(1, -2).

Would you like a graph of this transformation, further details on any steps, or explanations on secant function properties?

Here are 5 related questions:

  1. How does the period of y=sec(3x)y = \sec(3x) compare to y=sec(x)y = \sec(x)?
  2. What are the asymptotes for y=sec(x)y = \sec(x) and y=sec(3x)y = \sec(3x)?
  3. How does a horizontal compression affect the shape of periodic functions?
  4. What other transformations could you apply to y=sec(x)y = \sec(x)?
  5. How does the transformation of points change with horizontal or vertical shifts?

Tip: For transformations, always handle horizontal changes (inside the function) and vertical changes (outside the function) separately to avoid confusion!

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Secant Function
Transformations

Formulas

y = sec(x)
y = -sec(3x)
Horizontal compression factor: 1/3
Vertical reflection across the x-axis

Theorems

Transformation of trigonometric functions
Period of secant function: 2π
Effect of horizontal compression on the period

Suitable Grade Level

Grades 10-12