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D( x )
x < 0
x < 0
x in <0:+oo)
3*x-(4*x^(1/2))-7 = 0
3*x-4*x^(1/2)-7 = 0
t_1 = x^(1/2)
3*t_1^2-4*t_1^1-7 = 0
3*t_1^2-4*t_1-7 = 0
DELTA = (-4)^2-(-7*3*4)
DELTA = 100
DELTA > 0
t_1 = (100^(1/2)+4)/(2*3) or t_1 = (4-100^(1/2))/(2*3)
t_1 = 7/3 or t_1 = -1
t_1 = -1
x^(1/2)+1 = 0
1*x^(1/2) = -1 // : 1
x^(1/2) = -1
( -1 < 0 i 1/2 in (0:1) ) => x naleu017Cy do O
t_1 = 7/3
x^(1/2)-7/3 = 0
1*x^(1/2) = 7/3 // : 1
x^(1/2) = 7/3
x^(1/2) = 7/3 // ^ 2
x = 49/9
x = 49/9
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