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OpenStudy (anonymous):
NEED HELP! Factor this binomial completely: x^9 -y^9
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OpenStudy (idku):
\[a^2-b^2=(a-b)(a+b)\]
OpenStudy (anonymous):
You need to factor by making a substitution to create a more familiar form of the difference of two CUBES. Let z = x^3 so that you expression becomes z^3-z^3 ( because (x^3)^3 = z^3). Do you know the formula for factoring a^3-b^3?
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