Factor 21a5b7 – 7a4b6c
Practice factoring: 2la5b7 — 7a4b6c
Solving Systems of Equations Using the Elimination Method by Adding
Explanation of the elimination method of solving a system of equations. Adding the equations to eliminate a variable is quicker than using the substitution method, but requires that both equations be in the same form and that the system contain an a...
Facial Action Coding System, The
Psychologist and author Paul Ekman talks about his work in developing a Facial Action Coding System, which he describes as, "...like musical notation is to music. It's a way of describing exactly what's producing an expression." Based on that work, ...
Face of An Assassin
Psychologist and author Paul Ekman talks about utilizing his work on reading facial expressions to predict who in a crowd of people might be bent on assassination. Dr. Ekman notes that a facial expression alone isn't a guarantee of what someone is p...
Exponents: Summary: Exponents
This clip summarizes the key ideas in the exponents lesson, including powers, factors, bases, and the concepts of squared, square root, and cubed. It also explains how all these ideas can be used to develop a new form of expanded notation.
Exponents: Multiplying Expressions With the Same Base
This clip explains that to multiply expressions with the same base, we simply combine or telescope a complicated expression by adding the exponents together. The clip points out that this only works if the bases are the same. If the bases are differ...
Word Problems: Turning Word Problems Into Number Sentences
This clip explains that students who have no trouble with ordinary arithmetic sometimes get confused by word problems. The clip then suggests ways to solve word problems by breaking them down into a series of steps.