Khan Academy: Polynomial Basics: Subtracting Polynomials With Multiple Variables

While explaining how to add polynomial expressions with multiple variables, Sal uses academic vocabulary and a clear thinking process. This video is relatively short and would be appropriate for students working on homework or prepping...

Sal beautifully explains how to subtract two polynomial expressions with multiple variables. He groups like terms and the distributive property to create a single expression.

This video has a basic example of simplifying a polynomial expression with multiple variables.

This video demonstrates how to solve a word problem by calculating rates. The video uses the formula for distance and isolates the variable "r" for rate. Practice problems available. [4:08]

This video demonstrates how to write a polynomial that represents the difference between the area of a rectangle of given length and width and the area of a circle with a given diameter.

This video shows how to write a polynomial expression for a given situation.

Explains what like terms are and demonstrates how to simplify a polynomial.

Demonstrates how to subtract polynomials when there are multiple variables in each polynomial. [2:10]

Video reviews the notation of the expected value and variance of random variables. It then explains the expected value and variance of the sum of two random variables and explains why the variance of the difference of random variables is...

Video showing how to add and subtract numbers using significant figures. Contrasts adding and subtracting with significant figures with multiplying and dividing. [8:59]