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D( k )
k-2 = 0
k-2 = 0
k-2 = 0
k-2 = 0 // + 2
k = 2
k in (-oo:2) U (2:+oo)
10/(k-2) = -2 // + 2
10/(k-2)+2 = 0
10/(k-2)+(2*(k-2))/(k-2) = 0
2*(k-2)+10 = 0
2*k+6 = 0
(2*k+6)/(k-2) = 0
(2*k+6)/(k-2) = 0 // * k-2
2*k+6 = 0
2*k+6 = 0 // - 6
2*k = -6 // : 2
k = -6/2
k = -3
k = -3
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