Math Problem Statement

Solve this and also show the calculations

Let F(x) = (x^2 + 3x + 2)/(2 - |x|). Make tables of values of F at values of x that approach -2 from above and below. Then estimate lim x→−2 F(x).

Solution

The function given is:

F(x)=x2+3x+22xF(x) = \frac{x^2 + 3x + 2}{2 - |x|}

We are asked to estimate the limit as xx approaches 2-2 from both sides, i.e., limx2F(x)\lim_{x \to -2} F(x).

Step-by-Step Process:

  1. Analyze the function: The absolute value function x|x| causes two cases:

    • When x0x \geq 0, x=x|x| = x.
    • When x<0x < 0, x=x|x| = -x.
  2. Case when x0x \geq 0: For x0x \geq 0, the function becomes: F(x)=x2+3x+22xF(x) = \frac{x^2 + 3x + 2}{2 - x}

  3. Case when x<0x < 0: For x<0x < 0, the absolute value changes and the function becomes: F(x)=x2+3x+22+xF(x) = \frac{x^2 + 3x + 2}{2 + x}

Create Tables of Values:

We now need to create a table of values for F(x)F(x) as xx approaches 2-2 from above and below.

Approaching from the left ( x2x \to -2^-):

Use the function F(x)=x2+3x+22+xF(x) = \frac{x^2 + 3x + 2}{2 + x} for values of xx slightly less than 2-2.

Approaching from the right ( x2+x \to -2^+):

Use the function F(x)=x2+3x+22xF(x) = \frac{x^2 + 3x + 2}{2 - x} for values of xx slightly more than 2-2.

Let me compute these values next.Here are the computed values for F(x)F(x) as xx approaches 2-2:

Approaching from the left (x2x \to -2^-):

For F(x)=x2+3x+22+xF(x) = \frac{x^2 + 3x + 2}{2 + x}:

  • x=2.1x = -2.1, F(x)=1.1F(x) = -1.1
  • x=2.01x = -2.01, F(x)=1.01F(x) = -1.01
  • x=2.001x = -2.001, F(x)=1.001F(x) = -1.001
  • x=2.0001x = -2.0001, F(x)=1.0001F(x) = -1.0001

Approaching from the right (x2+x \to -2^+):

For F(x)=x2+3x+22xF(x) = \frac{x^2 + 3x + 2}{2 - x}:

  • x=1.9x = -1.9, F(x)=0.02308F(x) = -0.02308
  • x=1.99x = -1.99, F(x)=0.00248F(x) = -0.00248
  • x=1.999x = -1.999, F(x)=0.0002498F(x) = -0.0002498
  • x=1.9999x = -1.9999, F(x)=0.000024998F(x) = -0.000024998

Conclusion:

As x2x \to -2^-, the values of F(x)F(x) approach 1-1.
As x2+x \to -2^+, the values of F(x)F(x) approach 0.

Thus, the left-hand limit is 1-1 and the right-hand limit is 00, so the limit limx2F(x)\lim_{x \to -2} F(x) does not exist because the left and right limits are not equal.

Would you like further clarification or more details?


Here are 5 related questions to explore further:

  1. What is the significance of left-hand and right-hand limits in determining continuity?
  2. Can you explain what happens when limits from both sides are different?
  3. How does the presence of absolute value functions impact the behavior of limits?
  4. How would you compute the limits for values close to other points of interest in a similar function?
  5. What is the definition of a removable discontinuity, and does this function have one?

Tip: Always check limits from both sides when dealing with absolute value functions or piecewise functions!

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Math Problem Analysis

Mathematical Concepts

Limits
Piecewise Functions
Absolute Value

Formulas

F(x) = (x^2 + 3x + 2) / (2 - |x|)
Limit Formula

Theorems

Limit of a function at a point
Behavior of absolute value functions

Suitable Grade Level

Grades 11-12 (Calculus)