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D( x )
x < 0
x < 0
x in <0:+oo)
x-(4*x^(1/2))-12 = 0
x-4*x^(1/2)-12 = 0
t_1 = x^(1/2)
1*t_1^2-4*t_1^1-12 = 0
t_1^2-4*t_1-12 = 0
DELTA = (-4)^2-(-12*1*4)
DELTA = 64
DELTA > 0
t_1 = (64^(1/2)+4)/(1*2) or t_1 = (4-64^(1/2))/(1*2)
t_1 = 6 or t_1 = -2
t_1 = -2
x^(1/2)+2 = 0
1*x^(1/2) = -2 // : 1
x^(1/2) = -2
( -2 < 0 i 1/2 in (0:1) ) => x naleu017Cy do O
t_1 = 6
x^(1/2)-6 = 0
1*x^(1/2) = 6 // : 1
x^(1/2) = 6
x^(1/2) = 6 // ^ 2
x = 36
x = 36
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