3z^2-9z/z-3

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Solution for 3z^2-9z/z-3 equation: 


D( z )

z = 0

z = 0

z = 0

z in (-oo:0) U (0:+oo)

3*z^2-((9*z)/z)-3 = 0

3*z^2-9-3 = 0

3*z^2 = 12 // : 3

z^2 = 4

z^2 = 4 // ^ 1/2

abs(z) = 2

z = 2 or z = -2

z in { 2, -2 }

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