Math Problem Statement

Sketch a graph of this

Sketch a function, f(x), that has all the given properties. The function must be continuous for all x in R, except at points in which the given properties force a discontinuity: lim x→3 f(x) = 1, f(−3) = 3, lim x→2^+ f(x) = 1, lim x→2^- f(x) = −1, f(2) is undefined.

Solution

Let's analyze the given properties step by step and sketch a graph of the function based on them:

  1. limx3f(x)=1\lim_{x \to 3} f(x) = 1 means that as xx approaches 3, the function approaches 1. The function has a limit of 1 at x=3x = 3, but it doesn't necessarily equal 1 there.

  2. f(3)=3f(-3) = 3 tells us that the function equals 3 at x=3x = -3. This is a specific point on the graph: the coordinate (3,3)(-3, 3).

  3. limx2+f(x)=1\lim_{x \to 2^+} f(x) = 1 implies that as xx approaches 2 from the right (i.e., values just greater than 2), the function approaches 1.

  4. limx2f(x)=1\lim_{x \to 2^-} f(x) = -1 implies that as xx approaches 2 from the left (i.e., values just less than 2), the function approaches -1.

  5. f(2)f(2) is undefined, meaning that the function has a discontinuity at x=2x = 2.

Interpreting the behavior:

  • At x=3x = 3, the limit is 1, but the function could be different at x=3x = 3, so we should put a hole at x=3x = 3 with the function approaching 1.
  • At x=3x = -3, the function passes through the point (3,3)(-3, 3).
  • At x=2x = 2, the function is undefined, but we have different limits from both sides. From the left, it approaches -1, and from the right, it approaches 1. This is a jump discontinuity.

Based on these points, the graph would:

  1. Pass through (3,3)(-3, 3).
  2. Have a hole at x=3x = 3 approaching y=1y = 1.
  3. Jump from 1-1 to 11 at x=2x = 2, with the function undefined at exactly x=2x = 2.

Would you like me to generate a sketch of this graph?


Related questions:

  1. What type of discontinuity is at x=2x = 2, and why?
  2. How does the graph behave near x=3x = 3 and x=2x = 2?
  3. What would happen if the limit as xx approaches 3 was different from the value of f(3)f(3)?
  4. How would the graph change if f(2)f(2) were defined?
  5. Can a function be continuous but still have undefined points like in this case?

Tip:

When dealing with limits, always pay attention to the direction of approach (left-hand or right-hand limits) to identify potential jump discontinuities.

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Math Problem Analysis

Mathematical Concepts

Limits
Continuity
Discontinuity
Jump Discontinuity

Formulas

lim x→a f(x) = L
f(a) is undefined

Theorems

Continuity Theorem
Limit Definition
Discontinuity Classification

Suitable Grade Level

Grades 11-12 or College Level