Math Problem Statement

Evaluate the limit: lim (2x^3 - 3x^2 + 2x + 5) as x approaches -1.

Solution

To evaluate the limit limx1(2x33x2+2x+5)\lim_{x \to -1} \left(2x^3 - 3x^2 + 2x + 5\right), we can directly substitute x=1x = -1 into the polynomial since polynomials are continuous everywhere.

Let's calculate:

2(1)33(1)2+2(1)+52(-1)^3 - 3(-1)^2 + 2(-1) + 5

Now, let's evaluate each term:

2(1)3=2(1)=22(-1)^3 = 2(-1) = -2 3(1)2=3(1)=3-3(-1)^2 = -3(1) = -3 2(1)=22(-1) = -2 5 remains as 55 \text{ remains as } 5

So, substituting these into the expression:

232+5=7+5=2-2 - 3 - 2 + 5 = -7 + 5 = -2

Thus, the limit is:

limx1(2x33x2+2x+5)=2\lim_{x \to -1} \left(2x^3 - 3x^2 + 2x + 5\right) = -2

Would you like more details or have any other questions?

Here are some follow-up questions you might consider:

  1. How can you determine if a function is continuous at a point?
  2. What is the significance of continuity in evaluating limits?
  3. What are other methods to evaluate limits besides direct substitution?
  4. How would you evaluate a limit if the direct substitution led to an indeterminate form like 00\frac{0}{0}?
  5. Can you explain why polynomials are continuous everywhere?

Tip: When evaluating limits of polynomials, direct substitution is often the easiest method because polynomials are continuous at all points.

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Math Problem Analysis

Mathematical Concepts

Limits
Polynomial Functions

Formulas

Direct Substitution Method for Limits
Limit properties for continuous functions

Theorems

Continuity of Polynomials

Suitable Grade Level

Grades 11-12 or Introductory College Calculus