### About Multiplying & Dividing Rational Expressions:

When we multiply or divide rational expressions, we follow the same procedures as we used with fractions. To multiply rational expressions we factor each and cancel what we can. Afterwards, we find the product of the numerators and place the result over the product of the denominators. To divide rational expressions, we multiply the first rational expression by the reciprocal of the second.

Test Objectives
• Demonstrate the ability to multiply rational expressions
• Demonstrate the ability to divide rational expressions
• Demonstrate the ability to simplify a rational expression
Multiplying & Dividing Rational Expressions Practice Test:

#1:

Instructions: Perform each indicated operation.

a) $$\frac{m^2 - m - 30}{m^2 - 3m - 18} \cdot \frac{m^2 - 10m + 21}{m^2 + 2m - 15}$$

#2:

Instructions: Perform each indicated operation.

a) $$\frac{6a + 6}{3a + 9} \cdot \frac{5a}{5a^2 + 5a}$$

#3:

Instructions: Perform each indicated operation.

a) $$\frac{2x^2 - 16x + 30}{7x + 10} \cdot \frac{21x^2 + 65x + 50}{6x^2 - 8x - 30}$$

#4:

Instructions: Perform each indicated operation.

a) $$\frac{6}{5n - 15} ÷ \frac{n + 8}{n - 3}$$

#5:

Instructions: Perform each indicated operation.

a) $$\frac{8}{8k^2 + 80k} ÷ \frac{16k - 8}{2k^2 - 13k + 6}$$

Written Solutions:

#1:

Solutions:

a) $$\frac{m - 7}{m + 3}$$

#2:

Solutions:

a) $$\frac{2}{a + 3}$$

#3:

Solutions:

a) $$x - 5$$

#4:

Solutions:

a) $$\frac{6}{5(n + 8)}$$

#5:

Solutions:

a) $$\frac{k - 6}{8k(k + 10)}$$