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Mathematics 20 Online
OpenStudy (anonymous):

x^3-4x<0

OpenStudy (anonymous):

saifoo? you are getting sleepy

OpenStudy (saifoo.khan):

0<x<2

OpenStudy (saifoo.khan):

This^

OpenStudy (anonymous):

\[x^3-4x<0\] \[x(x-2)(x+2)<0\] zeros at -2, 0 and 2. it is a cubic polynomial with positive leading coefficient. therefore it is negative, then positive, then negative them positive.

OpenStudy (saifoo.khan):

:(

OpenStudy (anonymous):

nope

OpenStudy (saifoo.khan):

i was right till here^

OpenStudy (anonymous):

answer is \[(-\infty,-2)\cup (0,2)\]

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