Math Problem Statement

Evaluate the expression (x^3 - 2x^2 - 4) / (x - 2)

Solution

The given expression is:

x32x24x2\frac{x^3 - 2x^2 - 4}{x - 2}

To evaluate this, we need to perform polynomial division (synthetic division or long division). Let's divide x32x24x^3 - 2x^2 - 4 by x2x - 2.

Step 1: Perform synthetic division

The division of the polynomial can be done using synthetic division, but let's first try long division:

  1. Divide the leading term of x3x^3 by the leading term of xx, which gives x2x^2.
  2. Multiply x2x^2 by x2x - 2, which gives x32x2x^3 - 2x^2.
  3. Subtract x32x2x^3 - 2x^2 from x32x24x^3 - 2x^2 - 4, resulting in 04=40 - 4 = -4.

At this point, the remainder is 4-4, and the quotient is x2x^2. Therefore:

x32x24x2=x24x2\frac{x^3 - 2x^2 - 4}{x - 2} = x^2 - \frac{4}{x - 2}

This matches option d in the question.

Answer:

The correct option is d.

Would you like a more detailed explanation or have any further questions?

Here are some related questions:

  1. What is synthetic division and how does it work?
  2. Can we solve similar expressions with different divisors?
  3. What happens if the remainder is not zero in polynomial division?
  4. How do we factor polynomials to simplify expressions?
  5. What are some common errors when performing polynomial division?

Tip: Synthetic division is usually quicker than long division, especially for linear divisors like x2x - 2.

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Math Problem Analysis

Mathematical Concepts

Polynomial Division
Synthetic Division
Rational Expressions

Formulas

Polynomial Division Formula: (Dividend / Divisor)
Quotient = x^2 - 4/(x-2)

Theorems

Division Algorithm for Polynomials
Remainder Theorem

Suitable Grade Level

Grades 10-12