Math Problem Statement

Graph the function \( f(x) = 2 \left( \frac{1}{4} \right)^x - 5 \) on the axes below. You must plot the asymptote and any two points with integer coordinates.

Solution

To graph the function f(x)=2(14)x5f(x) = 2 \left( \frac{1}{4} \right)^x - 5 as requested, let’s analyze its characteristics.

  1. Function Structure: The function f(x)=2(14)x5f(x) = 2 \left( \frac{1}{4} \right)^x - 5 is an exponential decay function due to the base 14\frac{1}{4} (which is less than 1).

  2. Horizontal Asymptote: For exponential functions of the form abx+ca \cdot b^x + c, the horizontal asymptote is y=cy = c. Therefore, in this function, the asymptote is: y=5y = -5

  3. Points with Integer Coordinates:

    • To find points, we can calculate f(x)f(x) for a few integer values of xx.

    Let's find values at x=0x = 0 and x=1x = 1:

    • For x=0x = 0: f(0)=2(14)05=215=3f(0) = 2 \left( \frac{1}{4} \right)^0 - 5 = 2 \cdot 1 - 5 = -3 So, one point is (0,3)(0, -3).

    • For x=1x = 1: f(1)=2(14)15=2145=125=4.5f(1) = 2 \left( \frac{1}{4} \right)^1 - 5 = 2 \cdot \frac{1}{4} - 5 = \frac{1}{2} - 5 = -4.5 However, this does not give an integer coordinate.

    • For x=1x = -1: f(1)=2(14)15=245=85=3f(-1) = 2 \left( \frac{1}{4} \right)^{-1} - 5 = 2 \cdot 4 - 5 = 8 - 5 = 3 So, another point with integer coordinates is (1,3)(-1, 3).

Summary:

  • Asymptote: y=5y = -5
  • Integer Coordinate Points: (0,3)(0, -3) and (1,3)(-1, 3)

Graphing Steps:

  1. Plot the horizontal asymptote y=5y = -5.
  2. Mark the points (0,3)(0, -3) and (1,3)(-1, 3) on the graph.
  3. Draw a smooth curve passing through these points and approaching the asymptote as xx increases.

Would you like additional help with plotting, or any further clarification on these steps?


Here are some questions to extend your understanding:

  1. How does the base 14\frac{1}{4} affect the shape of the graph compared to a base greater than 1?
  2. What would happen to the graph if the constant 5-5 were changed?
  3. Why does the function approach y=5y = -5 but never reach it?
  4. How would this graph differ if the base were negative?
  5. What other points could we choose to make the graph more accurate?

Tip: When working with transformations, focus on the asymptote and key points to guide your sketch efficiently.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Graphing
Asymptotes

Formulas

f(x) = a \cdot b^x + c
Asymptote of exponential function y = c

Theorems

Properties of Exponential Decay

Suitable Grade Level

Grades 9-11