Adding Rational Expressions

Adding Rational Expressions

Refresher: Adding and Subtracting Fractions

• Must have common denominators.

• Common denominators are found by determining the LEAST COMMON MULTIPLE between the denominators

• In adding them, only add the numerators.

• In subtracting them, subtract the numerators

• Simplify!

Multiple Select

Check off ALL that is vital to add or subtrac;t fractions?

• Add/Subtract denominators

• Add/Subtract numerators

• Find a common denominator using the Least Common Multiple

• Find a common denominator using the Greatest Common Multiple

Adding Rational Expressions an Example

• Watch the video and take note of how the probelm is solved".

• https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:rational/x2ec2f6f830c9fb89:rational-add-sub-intro/v/adding-rational-expression-w-unlike-denominators

• Open a search browser and type in "adding-rational-expression-w-unlike-denominators" Khan and watch the corresponding video.

Multiple Choice

Based on the video, what's the easiest way to find common denominators?

• multiply the two denominators

• multiply the two numerators

Multiple Choice

Based on the video, whatever you multiply the denominator of each rational expression by you multiplied...

• the opposite by

• the denomiator by

Multiple Select

Based on the video, Sal should have had...in the numerator.

• 8x^2

• 8x^3

• 8x^4

Now you try one!

Practice Problem

Add the given rational expressions

Practice Problem

Here's the solution! How did you do?