9/u=u/4

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Solution for 9/u=u/4 equation: 


D( u )

u = 0

u = 0

u = 0

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

9/u = u/4 // - u/4

9/u-(u/4) = 0

9*u^-1-1/4*u^1 = 0

(9*u^0-1/4*u^2)/(u^1) = 0 // * u^2

u^1*(9*u^0-1/4*u^2) = 0

u^1

(-1/4)*u^2+9 = 0

(-1/4)*u^2+9 = 0

DELTA = 0^2-(4*9*(-1/4))

DELTA = 9

DELTA > 0

u = (9^(1/2)+0)/(2*(-1/4)) or u = (0-9^(1/2))/(2*(-1/4))

u = -6 or u = 6

u in { -6, 6} 

u in { -6, 6 }

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