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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
9-(2/k) = 1 // - 1
9-(2/k)-1 = 0
9-2*k^-1-1 = 0
-2*k^-1 = -8 // : -2
k^-1 = 4
-1 < 0
1/(k^1) = 4 // * k^1
1 = 4*k^1 // : 4
1/4 = k^1
k = 1/4
k = 1/4
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