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D( x )
2*x < 0
2*x < 0
2*x < 0
2*x+0 < 0 // - 0
2*x < 0 // : 2
x < 0/2
x < 0
x in <0:+oo)
x-(2*x)^(1/2)-4 = 0
x-x^(1/2)-4 = 0
t_1 = x^(1/2)
1*t_1^2-1*t_1^1-4 = 0
t_1^2-t_1-4 = 0
DELTA = (-1)^2-(-4*1*4)
DELTA = 17
DELTA > 0
t_1 = (17^(1/2)+1)/(1*2) or t_1 = (1-17^(1/2))/(1*2)
t_1 = (17^(1/2)+1)/2 or t_1 = (1-17^(1/2))/2
t_1 = (1-17^(1/2))/2
x^(1/2)-((1-17^(1/2))/2) = 0
1*x^(1/2) = (1-17^(1/2))/2 // : 1
x^(1/2) = (1-17^(1/2))/2
( (1-17^(1/2))/2 < 0 i 1/2 in (0:1) ) => x należy do O
t_1 = (17^(1/2)+1)/2
x^(1/2)-((17^(1/2)+1)/2) = 0
1*x^(1/2) = (17^(1/2)+1)/2 // : 1
x^(1/2) = (17^(1/2)+1)/2
x^(1/2) = (17^(1/2)+1)/2 // ^ 2
x = ((17^(1/2)+1)^2)/4
x = ((17^(1/2)+1)^2)/4
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