Math Problem Statement

What are the domain and range of g(x) = 8|x| − 2?

Solution

For the function g(x)=8x2g(x) = 8|x| - 2, let's find the domain and range:

1. Domain:

  • The domain of g(x)g(x) refers to all possible input values for xx.
  • Since the absolute value function x|x| is defined for all real numbers, the function g(x)=8x2g(x) = 8|x| - 2 can accept any real number xx.

Thus, the domain is: (,)\boxed{(-\infty, \infty)}

2. Range:

  • The absolute value x|x| is always non-negative, so 8x08|x| \geq 0.
  • This means g(x)=8x22g(x) = 8|x| - 2 \geq -2 for all xx, since the smallest value of 8x8|x| is 0 when x=0x = 0.
  • The minimum value of g(x)g(x) occurs when x=0x = 0, and in that case: g(0)=802=2g(0) = 8|0| - 2 = -2
  • As x|x| increases (for either positive or negative values of xx), g(x)g(x) increases without bound.

Thus, the range is: [2,)\boxed{[-2, \infty)}

Would you like further details on how the range was derived or have any questions?

Related Questions:

  1. How would the domain and range change if the function were g(x)=8x2g(x) = 8x - 2?
  2. What is the graph of the function g(x)=8x2g(x) = 8|x| - 2 and how does it look?
  3. What is the behavior of g(x)=8x2g(x) = 8|x| - 2 as xx \to \infty?
  4. How does modifying the coefficient of x|x| affect the range?
  5. What is the value of g(x)g(x) at x=2x = -2 and x=2x = 2?

Tip:

The absolute value function x|x| creates symmetry about the y-axis. This is important when analyzing functions like g(x)=8x2g(x) = 8|x| - 2.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Functions
Domain and Range
Linear Transformations

Formulas

g(x) = 8|x| - 2

Theorems

Properties of Absolute Value
Range of Linear Functions

Suitable Grade Level

Grades 9-11