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OpenStudy (anonymous):
9-4z^2 would that be (3-2z)^2?
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OpenStudy (anonymous):
no when you multiply (3-2z) * (3-2z) what is the result
OpenStudy (anonymous):
heh, true. 3-2z) (3+2z) ?
OpenStudy (anonymous):
you are right now.. its \[(3-2z) * (3+2z) = 3^2 - (2z)^2=9-4z^2\]
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