Khan Academy: Adding & Subtracting Vectors

Add and subtract vectors given in component form. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Sal demonstrates adding and subtracting rational expressions with like denominators. [3:44]

Sal adds 6/(2x^2-7) + (-3x-8)/(2x^2-7) and subtracts (9x^2+3)/(14x^2-9) - (-3x^2+5)/(14x^2-9).

Sal defines what it means to add or subtract matrices. He shows a few examples and discusses some important properties of matrix addition and subtraction.

Learn how to find the result of matrix addition and subtraction operations.

Have you learned the basics of rational expression addition/subtraction? Great! Now dig deeper with some advanced examples.

Adding and subtracting polynomials is all about combining like terms. When the terms have two variables, it gets a little bit tricky to figure out which terms are like terms. In this article, we review some examples and give you a chance...

Adding and subtracting polynomials is all about combining like terms. In this article, we review some examples and give you a chance for you to practice the skill yourself.

Work a problem on adding and subtracting polynomials with two variables. Video is available if you need a hint.

Example: Subtract or add polynomials. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.