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OpenStudy (anonymous):
5z^2=20z please help solve for z.
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OpenStudy (saifoo.khan):
z = 4
OpenStudy (lalaly):
z^2-4z =0 z(z-4)=0 z=0 or z=4
OpenStudy (anonymous):
not only 4, but as lalaly wrote z=0 and z=4 . z^2-4z =0 z(z-4)=0 z=0 or z=4
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