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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(2/7)*k-(8/k)+5+7 = 0
(2/7)*k-8*k^-1+5+7 = 0
2/7*k^1-8*k^-1+12*k^0 = 0
(2/7*k^2+12*k^1-8*k^0)/(k^1) = 0 // * k^2
k^1*(2/7*k^2+12*k^1-8*k^0) = 0
k^1
(2/7)*k^2+12*k-8 = 0
(2/7)*k^2+12*k-8 = 0
DELTA = 12^2-(-8*4*(2/7))
DELTA = 1072/7
DELTA > 0
k = ((1072/7)^(1/2)-12)/(2*(2/7)) or k = (-(1072/7)^(1/2)-12)/(2*(2/7))
k = 7/4*((1072/7)^(1/2)-12) or k = -7/4*((1072/7)^(1/2)+12)
k in { -7/4*((1072/7)^(1/2)+12), 7/4*((1072/7)^(1/2)-12)}
k in { -7/4*((1072/7)^(1/2)+12), 7/4*((1072/7)^(1/2)-12) }
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