How to Multiply Rational Expressions

How to Multiply Rational Expressions

A rational expression is a ratio of two polynomials and there is a simple way to multiply these expressions, which we will teach you in this article with examples.

Related Topics

Method of Multiplying Rational Expressions

  • Multiplying rational expressions is the same as multiplying fractions. First, multiply numerators and then multiply denominators. Then, simplify as needed.

Examples

Multiplying Rational Expressions – Example 1:

Solve: \(\frac{x + 6}{x- 1}×\frac{x – 1}{5}= \)

Solution:

Multiply numerators and denominators: \(\frac{a}{b}×\frac{c}{d}=\frac{a×c}{b×d}\)
\(\frac{x+6}{x-1}×\frac{x-1}{5}=\frac{(x+6)(x-1)}{5(x- 1)}\)
Cancel the common factor: \((x- 1)\)
Then: \(\frac{(x + 6)(x-1)}{5(x- 1)}=\frac{(x + 6)}{5}\)

Multiplying Rational Expressions – Example 2:

Solve: \(\frac{x – 2}{x+3}×\frac{2x + 6}{x – 2}=\)

Solution:

Multiply numerators and denominators: \(\frac{x – 2}{x+3}×\frac{2x + 6}{x – 2}=\frac{(x – 2)(2x + 6)}{(x+3)(x-2)}\)
Cancel the common factor: \(\frac{(x – 2)(2x + 6)}{(x+3)(x-2)}=\frac{(2x + 6)}{(x+3)}\)
Factor \(2x+6=2(x+3)\)
Then: \(\frac{2(x+3)}{(x+3)}=2\)

Multiplying Rational Expressions – Example 3:

Solve: \(\frac{x + 5}{x- 1}×\frac{x – 1}{3}=\)

Solution:

Multiply fractions: \(\frac{x + 5}{x- 1}×\frac{x – 1}{3}=\frac{(x + 5)(x-1)}{3(x- 1)}\)
Cancel the common factor: \((x- 1)\),then: \(\frac{(x + 5)(x-1)}{3(x- 1)}=\frac{(x + 5)}{3}\)

Multiplying Rational Expressions – Example 4:

Solve: \(\frac{x – 5}{x+4}×\frac{2x + 8}{x – 5}=\)

Solution:

Multiply fractions: \(\frac{x – 5}{x+4}×\frac{2x + 8}{x – 5}=\frac{(x – 5)(2x + 8)}{(x+4)(x-5)}\)
Cancel the common factor: \(\frac{(x – 5)(2x + 8)}{(x+4)(x-5)}=\frac{(2x + 8)}{(x+4)}\)
Factor \(2x+8=2(x+4)\), Then: \(\frac{2(x+4)}{(x+4)}=2\)

Exercises for Multiplying Rational Expressions

Multiply Rational Expressions.

  1. \(\color{blue}{\frac{x-4}{x+3}×\frac{x + 6}{x – 4}=}\)
  2. \(\color{blue}{\frac{x+5}{x+2}×\frac{x }{x+5}=}\)
  3. \(\color{blue}{\frac{x+9}{x}×\frac{x^2 }{x+9}=}\)
  4. \(\color{blue}{\frac{3x^2}{10}×\frac{5 }{4x}=}\)
  5. \(\color{blue}{\frac{x+2}{5x}×\frac{6 }{6x+12}=}\)
  6. \(\color{blue}{\frac{x-3}{3x+4}×\frac{9x+12 }{x-3}=}\)
This image has an empty alt attribute; its file name is answers.png
  1. \(\color{blue}{\frac{x+6}{x+3}}\)
  2. \(\color{blue}{\frac{x}{x+2}}\)
  3. \(\color{blue}{x}\)
  4. \(\color{blue}{\frac{3x}{8}}\)
  5. \(\color{blue}{\frac{1}{5x}}\)
  6. \(\color{blue}{3}\)

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