Math Problem Statement

write down the range of f(x)=54x-13, -2<x<20

Solution

To find the range of the function f(x)=54x13f(x) = 54x - 13 over the domain 2<x<20-2 < x < 20:

Steps:

  1. The function f(x)=54x13f(x) = 54x - 13 is a linear function, which means it is continuous and strictly increasing (since 54>054 > 0) over its domain.

  2. Evaluate f(x)f(x) at the endpoints of the domain:

    • Lower endpoint (x=2x = -2): f(2)=54(2)13=10813=121f(-2) = 54(-2) - 13 = -108 - 13 = -121
    • Upper endpoint (x=20x = 20): f(20)=54(20)13=108013=1067f(20) = 54(20) - 13 = 1080 - 13 = 1067
  3. Since f(x)f(x) is strictly increasing, the range is: (121,1067)\boxed{(-121, 1067)}

This range excludes 121-121 and 10671067 because the domain excludes x=2x = -2 and x=20x = 20. If the endpoints were included, the range would be [121,1067][-121, 1067].

Would you like more detailed explanations or further assistance?

Related Questions:

  1. What is the slope of the function f(x)f(x) and how does it affect the range?
  2. How would the range change if xx were a closed interval, [2,20][-2, 20]?
  3. What are the intercepts of f(x)=54x13f(x) = 54x - 13?
  4. How would you find the inverse of f(x)=54x13f(x) = 54x - 13?
  5. What does the steepness of the line 54x1354x - 13 tell us about its behavior over this interval?

Tip: For linear functions, always check the values at the endpoints of the domain to determine the range!

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Domain and Range

Formulas

f(x) = mx + b

Theorems

Range of a Linear Function

Suitable Grade Level

Grades 9-11