Math Problem Statement

Graph the function f(x) = |x| and find the limits lim(x -> 0) |x| and lim(x -> 1) |x|.

Solution

Let's break down the problem from the image you provided.

The task asks you to:

  1. Graph the function f(x)=xf(x) = |x|.
  2. Find the following limits:
    • limx0x\lim_{x \to 0} |x|
    • limx1x\lim_{x \to 1} |x|

1. Graphing f(x)=xf(x) = |x|

The function f(x)=xf(x) = |x| represents the absolute value of xx. The graph is a V-shape:

  • For x0x \geq 0, x=x|x| = x.
  • For x<0x < 0, x=x|x| = -x.

This means the graph has a sharp corner at x=0x = 0, and it is symmetric about the y-axis.

2. Finding the Limits

(a) limx0x\lim_{x \to 0} |x|

To find this limit, we evaluate the behavior of x|x| as xx approaches 0 from both directions:

  • As x0+x \to 0^+ (from the right), x=x|x| = x, and x0x \to 0.
  • As x0x \to 0^- (from the left), x=x|x| = -x, and x0-x \to 0.

Thus, the two-sided limit exists, and limx0x=0\lim_{x \to 0} |x| = 0.

(b) limx1x\lim_{x \to 1} |x|

Here we consider the behavior of x|x| as xx approaches 1:

  • As x1+x \to 1^+, x=x=1|x| = x = 1.
  • As x1x \to 1^-, x=x=1|x| = -x = 1 (since the absolute value is still positive).

Therefore, limx1x=1\lim_{x \to 1} |x| = 1.


Would you like further clarification or additional details on the graph or limits?

Here are 5 related questions to help deepen your understanding:

  1. How would the graph of f(x)=xf(x) = |x| change if it was f(x)=x2f(x) = |x-2|?
  2. What is the difference between a one-sided limit and a two-sided limit?
  3. How does the sharp corner at x=0x = 0 affect the differentiability of f(x)=xf(x) = |x|?
  4. Can you think of another function with a sharp corner like f(x)=xf(x) = |x|?
  5. How would you compute limx1x\lim_{x \to -1} |x|?

Tip: When dealing with limits, always consider the behavior from both the left-hand and right-hand sides to ensure the two-sided limit exists.

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Math Problem Analysis

Mathematical Concepts

Limits
Graphing functions
Absolute value

Formulas

f(x) = |x|
lim(x -> 0) |x|
lim(x -> 1) |x|

Theorems

Limit definition
Continuity of absolute value function

Suitable Grade Level

Grades 10-12