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OpenStudy (anonymous):
factor y^5-81y
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OpenStudy (anonymous):
y^5 -81y = y(y^4 -81) = y [ (y^2)^2 - (9)^2 ] =y[(y^2-9) (y^2+9)] =y[ {(y)^2 -(3)^2} (y^2+9)] =y(y-3)(y+3)(y^2+9)
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