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D( x )
x < 0
x < 0
x in <0:+oo)
x-(14*x^(1/2))+48 = 0
x-14*x^(1/2)+48 = 0
t_1 = x^(1/2)
1*t_1^2-14*t_1^1+48 = 0
t_1^2-14*t_1+48 = 0
DELTA = (-14)^2-(1*4*48)
DELTA = 4
DELTA > 0
t_1 = (4^(1/2)+14)/(1*2) or t_1 = (14-4^(1/2))/(1*2)
t_1 = 8 or t_1 = 6
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
t_1 = 8
x^(1/2)-8 = 0
1*x^(1/2) = 8 // : 1
x^(1/2) = 8
x^(1/2) = 8 // ^ 2
x = 64
x in { 36, 64 }
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