MATH 090

Factoring Differences of Squares – Khan Academy

If we expand (a+b)(a-b) we will get a²-b². Factorization goes the other way: suppose we have an expression that is the difference of two squares, like x²-25 or 49x²-y², then we can factor is using the roots of those squares. For example, x²-25 can be factored as (x+5)(x-5). This is an extremely useful method that is used throughout math. Created by Sal Khan and Monterey Institute for Technology and Education.

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Properties of Exponents – Khan Academy

Learn how to simplify exponents when the numbers are multiplied with each other. We’ll learn that (a*b)^c is the same as a^c*b^c, a^c*a^d is same as a^(c+d) and (a^c)^d is equal to a^(c*d). We will also solve examples based on these three properties. Created by Sal Khan and CK-12 Foundation.

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Power Rule for Exponents

Learn how to simplify exponents when the numbers are multiplied with each other. We’ll learn that (a*b)^c is the same as a^c*b^c, a^c*a^d is same as a^(c+d) and (a^c)^d is equal to a^(c*d). We will also solve examples based on these three properties. Created by Sal Khan and CK-12 Foundation.

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