Math Problem Statement

Perform the following multiplication: (10x^2 + 13x - 3)/(x^2 - 4x + 4) * (x^2 - 4)/(5x^2 + 9x - 2)

Solution

The expression in the image asks to perform the multiplication:

10x2+13x3x24x+4x245x2+9x2\frac{10x^2 + 13x - 3}{x^2 - 4x + 4} \cdot \frac{x^2 - 4}{5x^2 + 9x - 2}

Let's go through the steps for solving this multiplication:

Step 1: Factor all polynomials, if possible.

  1. Numerator of the first fraction: 10x2+13x310x^2 + 13x - 3:

    • This is a quadratic expression. We look for factors of 10×(3)=3010 \times (-3) = -30 that add to 1313. The factors are 1515 and 2-2, so we rewrite and factor by grouping: 10x2+15x2x3=5x(2x+3)1(2x+3)=(5x1)(2x+3)10x^2 + 15x - 2x - 3 = 5x(2x + 3) - 1(2x + 3) = (5x - 1)(2x + 3)
  2. Denominator of the first fraction: x24x+4x^2 - 4x + 4:

    • This is a perfect square trinomial: x24x+4=(x2)2x^2 - 4x + 4 = (x - 2)^2
  3. Numerator of the second fraction: x24x^2 - 4:

    • This is a difference of squares: x24=(x2)(x+2)x^2 - 4 = (x - 2)(x + 2)
  4. Denominator of the second fraction: 5x2+9x25x^2 + 9x - 2:

    • We factor this quadratic expression. We look for factors of 5×(2)=105 \times (-2) = -10 that add to 99, which are 1010 and 1-1: 5x2+10xx2=5x(x+2)1(x+2)=(5x1)(x+2)5x^2 + 10x - x - 2 = 5x(x + 2) - 1(x + 2) = (5x - 1)(x + 2)

Step 2: Multiply the factored forms.

Now we rewrite the entire expression in factored form: (5x1)(2x+3)(x2)2(x2)(x+2)(5x1)(x+2)\frac{(5x - 1)(2x + 3)}{(x - 2)^2} \cdot \frac{(x - 2)(x + 2)}{(5x - 1)(x + 2)}

Step 3: Cancel common factors.

  • The factor (5x1)(5x - 1) appears in both the numerator and denominator, so it cancels out.
  • The factor (x2)(x - 2) appears in both the numerator and denominator, so one of them cancels out with one of the (x2)(x - 2) factors in the denominator.
  • The factor (x+2)(x + 2) appears in both the numerator and denominator, so it cancels out.

After canceling, we are left with: 2x+3x2\frac{2x + 3}{x - 2}

Final Answer:

The result of the multiplication is: 2x+3x2\frac{2x + 3}{x - 2}

Let me know if you need further clarifications or if you'd like additional details!


Here are 5 related questions to further your understanding:

  1. How do you factor a trinomial like ax2+bx+cax^2 + bx + c?
  2. What is the difference of squares and how is it factored?
  3. Why do common factors cancel out in a rational expression?
  4. Can all quadratics be factored? If not, what methods are used to solve them?
  5. How can you check your work after multiplying rational expressions?

Tip: Always look for common factors in both the numerator and denominator before multiplying expressions, as it simplifies the process significantly.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Factorization
Rational Expressions
Factoring Trinomials

Formulas

Difference of squares: a^2 - b^2 = (a - b)(a + b)
Factoring trinomials: ax^2 + bx + c

Theorems

Quadratic Factorization
Simplification of Rational Expressions

Suitable Grade Level

Grades 9-12