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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
8/k = 6*k-26 // - 6*k-26
8/k-(6*k)+26 = 0
8/k-6*k+26 = 0
8*k^-1-6*k^1+26*k^0 = 0
(26*k^1-6*k^2+8*k^0)/(k^1) = 0 // * k^2
k^1*(26*k^1-6*k^2+8*k^0) = 0
k^1
26*k-6*k^2+8 = 0
26*k-6*k^2+8 = 0
DELTA = 26^2-(-6*4*8)
DELTA = 868
DELTA > 0
k = (868^(1/2)-26)/(-6*2) or k = (-868^(1/2)-26)/(-6*2)
k = (2*217^(1/2)-26)/(-12) or k = (-2*217^(1/2)-26)/(-12)
k in { (2*217^(1/2)-26)/(-12), (-2*217^(1/2)-26)/(-12)}
k in { (2*217^(1/2)-26)/(-12), (-2*217^(1/2)-26)/(-12) }
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