Cool math Algebra Help Lessons: Exponents

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Coolmath Algebra
Exponents lesson 5 - Exponent Rule #4 (page 2 of 3) page 1
---- This algebra lesson explains the fourth rule of exponents.

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Why do we need these rules? Let's go back to an old example from rule #2:

w^3 / w^5 = w^(3-5) = w^(-2) = 1 / w^2

Look at this carefully... It makes sense, doesn't it? The problem was that the -2 exponent was confusing... So, we need a way to deal with it.

Check out an example with just numbers:

2^(-3) = 1 / 2^3 = 1 / 8

TRY IT:

3^(-4) = _____ 4^(-1) = _____ 1 / 5^(-2) = _____

One of the games we'll be playing is to rewrite things so that there are no negative exponents.

Check it out:

-2 / w^(-3) = -2w^3
This negative is not effected!

Continued on the next page

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