Math Problem Statement

Find the product of the two rational expressions (y^2 - 4) / (6y - 12) * (y + 6) / (y + 2).

Solution

The problem is asking to "Find the product" of the two given rational expressions:

y246y12y+6y+2\frac{y^2 - 4}{6y - 12} \cdot \frac{y + 6}{y + 2}

Let's break it down step by step:

Step 1: Factor each expression

  • The first numerator y24y^2 - 4 is a difference of squares and can be factored as: y24=(y2)(y+2)y^2 - 4 = (y - 2)(y + 2)

  • The first denominator 6y126y - 12 has a common factor of 6: 6y12=6(y2)6y - 12 = 6(y - 2)

Now the first fraction becomes: (y2)(y+2)6(y2)\frac{(y - 2)(y + 2)}{6(y - 2)}

  • The second fraction y+6y+2\frac{y + 6}{y + 2} cannot be simplified further.

Step 2: Simplify the product

Now multiply the two simplified expressions:

(y2)(y+2)6(y2)y+6y+2\frac{(y - 2)(y + 2)}{6(y - 2)} \cdot \frac{y + 6}{y + 2}

Before multiplying, notice that we can cancel the common factors:

  • y2y - 2 appears in both the numerator and denominator, so we can cancel it.
  • y+2y + 2 appears in both the numerator and denominator, so we can cancel it as well.

After canceling, we are left with:

16(y+6)\frac{1}{6} \cdot (y + 6)

Step 3: Multiply the remaining terms

The final product is:

y+66\frac{y + 6}{6}

Thus, the simplified product is:

y+66\frac{y + 6}{6}

Would you like more details or have any questions about this solution?

Related Questions:

  1. How do you factor a difference of squares in general?
  2. Can you always cancel terms from the numerator and denominator of a rational expression?
  3. What happens if you cannot factor the expression?
  4. How do you handle products of rational expressions with more complex polynomials?
  5. What is the importance of checking for restrictions on yy (like division by zero) in these types of problems?

Tip:

Always look for common factors between the numerator and denominator before multiplying rational expressions to simplify the problem quickly.

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Math Problem Analysis

Mathematical Concepts

Algebra
Rational Expressions
Factoring
Simplification

Formulas

Difference of squares: a^2 - b^2 = (a - b)(a + b)
Factoring out common terms in expressions

Theorems

Cancellation property of rational expressions

Suitable Grade Level

Grades 9-10