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OpenStudy (anonymous):
Fully factorize 3y^2-27 The answer is 3(y+3)(y-3), but why? I'm lost.
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OpenStudy (anonymous):
3y^2-27 = 3(y^2-9)
OpenStudy (anonymous):
=3( y^2-3^2) 3(y+3)(y-3)
OpenStudy (anonymous):
a^2-b^2 = (a+b) (a-b)
OpenStudy (anonymous):
Thanks, makes a lot more sense to me now! (:
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