Factor: 12x2 - 17x 6
Practice factoring a trinomial with a negative middle term: 12x2 - 17x 6.
Practical Problem: Subtracting Boxes in a Warehouse
A practical problem solved using subtraction in an algebraic expression.
Practical Problem: The Area of a Garden
Using multiplication of polynomials in a practical problem.
Subtracting Like Terms
Subtracting like terms demonstrated and applied to a practical problem.
Factor: 3c2 - 13cd 14d2
Practice factoring a trinomial with two different variables: 3c2 - 13cd 14d2.
Rules for Subtracting Algebraic Expressions
Rules for subtracting one algebraic expression from another and a step-by-step demonstration.
Multiplying Both Sides of an Equation by -1
By multiplying both side of an equation by negative one, you can change negative signs to positive, making an equation easier to work with.
Signed Numbers: Introducing Negative Numbers
This clip uses the number line to illustrate that there can be negative numbers as well as positive numbers. Negative numbers on the number line are located to the left of the zero, rather than to the right.
Signed Numbers: Positive Numbers
This clip explains that the symbol for positive numbers is the plus sign. If a number has no sign at all, it's understood to be positive. On the number line, the positive numbers are lined up in order to the right of the zero, in what is called "the...
Subtracting Whole Numbers: Using the Addition Facts in Subtraction
This clip makes the case that "since every subtraction fact is an addition fact in disguise, learning them isn't so hard."