Cool math Algebra Help Lessons: Exponents

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Coolmath Algebra
Exponents lesson 7 - Exponent Rule #5 (page 3 of 3) page 1
---- This algebra lesson explains the fifth rule of exponents.

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( x + y )^2 = x^2 + 2xy + y^2 definitely NOT x^2 + y^2

Take a close look at what's different here:

( xy )^2

These are being multiplied...
We can use the rule:

( x + y )^2

These are being added...
We CANNOT use the
rule!

(with negative exponents)

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