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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+6 = 48/x // - 48/x
x-(48/x)+6 = 0
x-48*x^-1+6 = 0
1*x^1-48*x^-1+6*x^0 = 0
(1*x^2+6*x^1-48*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+6*x^1-48*x^0) = 0
x^1
x^2+6*x-48 = 0
x^2+6*x-48 = 0
DELTA = 6^2-(-48*1*4)
DELTA = 228
DELTA > 0
x = (228^(1/2)-6)/(1*2) or x = (-228^(1/2)-6)/(1*2)
x = (2*57^(1/2)-6)/2 or x = (-2*57^(1/2)-6)/2
x in { (-2*57^(1/2)-6)/2, (2*57^(1/2)-6)/2}
x in { (-2*57^(1/2)-6)/2, (2*57^(1/2)-6)/2 }
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