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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
9/k-7 = 6*k // - 6*k
9/k-(6*k)-7 = 0
9/k-6*k-7 = 0
9*k^-1-6*k^1-7*k^0 = 0
(9*k^0-6*k^2-7*k^1)/(k^1) = 0 // * k^2
k^1*(9*k^0-6*k^2-7*k^1) = 0
k^1
9-6*k^2-7*k = 0
9-6*k^2-7*k = 0
DELTA = (-7)^2-(-6*4*9)
DELTA = 265
DELTA > 0
k = (265^(1/2)+7)/(-6*2) or k = (7-265^(1/2))/(-6*2)
k = (265^(1/2)+7)/(-12) or k = (7-265^(1/2))/(-12)
k in { (265^(1/2)+7)/(-12), (7-265^(1/2))/(-12)}
k in { (265^(1/2)+7)/(-12), (7-265^(1/2))/(-12) }
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