7u=252/u

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Solution for 7u=252/u equation: 


D( u )

u = 0

u = 0

u = 0

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

7*u = 252/u // - 252/u

7*u-(252/u) = 0

7*u-252*u^-1 = 0

7*u^1-252*u^-1 = 0

(7*u^2-252*u^0)/(u^1) = 0 // * u^2

u^1*(7*u^2-252*u^0) = 0

u^1

7*u^2-252 = 0

7*u^2-252 = 0

DELTA = 0^2-(-252*4*7)

DELTA = 7056

DELTA > 0

u = (7056^(1/2)+0)/(2*7) or u = (0-7056^(1/2))/(2*7)

u = 6 or u = -6

u in { -6, 6} 

u in { -6, 6 }

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