Math Problem Statement

Evaluate the limit limx→2(−3(x−2)/4|x−2|).

Solution

We are asked to evaluate the limit:

limx2(3(x2)4x2)\lim_{x \to 2} \left( -\frac{3(x - 2)}{4 |x - 2|} \right)

Step 1: Break it into two cases

Since the expression involves x2|x - 2|, we need to handle this piecewise, depending on whether xx is approaching 2 from the left (i.e., x2x \to 2^-) or from the right (i.e., x2+x \to 2^+).

Case 1: x2+x \to 2^+ (Approaching from the right)

When x>2x > 2, we have x2=x2|x - 2| = x - 2. Therefore, the expression becomes:

limx2+(3(x2)4(x2))\lim_{x \to 2^+} \left( -\frac{3(x - 2)}{4(x - 2)} \right)

Simplifying this:

limx2+(34)=34\lim_{x \to 2^+} \left( -\frac{3}{4} \right) = -\frac{3}{4}

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

When x<2x < 2, we have x2=(x2)|x - 2| = -(x - 2). Therefore, the expression becomes:

limx2(3(x2)4((x2)))\lim_{x \to 2^-} \left( -\frac{3(x - 2)}{4(-(x - 2))} \right)

Simplifying this:

limx2(34)=34\lim_{x \to 2^-} \left( \frac{3}{4} \right) = \frac{3}{4}

Step 2: Conclusion

We observe that the limit from the right is 34-\frac{3}{4} and the limit from the left is 34\frac{3}{4}. Since these two one-sided limits are not equal, the two-sided limit does not exist.

Thus, the limit is:

limx2(3(x2)4x2) does not exist.\lim_{x \to 2} \left( -\frac{3(x - 2)}{4 |x - 2|} \right) \text{ does not exist.}

Would you like further details or have any questions?

Here are some related questions:

  1. How does the absolute value function impact limits?
  2. What are one-sided limits and why are they important?
  3. Can a function have different one-sided limits?
  4. How do you evaluate limits involving absolute value?
  5. What is the significance of piecewise functions in limit evaluation?

Tip: When working with absolute values in limits, always consider both sides (left and right) to ensure the correct limit behavior.

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Math Problem Analysis

Mathematical Concepts

Limits
Absolute Value
Piecewise Functions
One-sided Limits

Formulas

lim_{x \to 2} \left( -\frac{3(x - 2)}{4 |x - 2|} \right)
Absolute Value: |x - 2|
Piecewise Case: lim_{x \to 2^+} and lim_{x \to 2^-}

Theorems

Limit Theorem
Piecewise Function Limit Evaluation
One-sided Limit Theorem

Suitable Grade Level

Undergraduate Calculus or Advanced High School (Grades 11-12)