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D( k )
k < 0
k < 0
k in <0:+oo)
0.2*k^(1/2) = 0.1*k // - 0.1*k
0.2*k^(1/2)-(0.1*k) = 0
0.2*k^(1/2)-0.1*k = 0
t_1 = k^(1/2)
0.2*t_1^1-0.1*t_1^2 = 0
0.2*t_1-0.1*t_1^2 = 0
DELTA = 0.2^2-(-0.1*0*4)
DELTA = 0.2^2
DELTA = 0.04
DELTA > 0
t_1 = ((0.2^2)^(1/2)-0.2)/(-0.1*2) or t_1 = (-(0.2^2)^(1/2)-0.2)/(-0.1*2)
t_1 = 0 or t_1 = 2
t_1 = 0
k^(1/2)+0 = 0
k^(1/2) = 0
1*k^(1/2) = 0 // : 1
k^(1/2) = 0
k = 0
t_1 = 2
k^(1/2)-2 = 0
1*k^(1/2) = 2 // : 1
k^(1/2) = 2
k^(1/2) = 2 // ^ 2
k = 4
k in { 0, 4 }
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