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Mathematics 20 Online
OpenStudy (anonymous):

3b^3 - 15b = 72b

OpenStudy (anonymous):

3b^3-15b-72b=0 3b^3-87b=0 b(3b^2-87)=0 whether b=0 or 3b^2=87=>b^2=87/3 b=sqrt(87/3)

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