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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24*x-(72/x)+3 = 0
24*x-72*x^-1+3 = 0
24*x^1-72*x^-1+3*x^0 = 0
(24*x^2+3*x^1-72*x^0)/(x^1) = 0 // * x^2
x^1*(24*x^2+3*x^1-72*x^0) = 0
x^1
24*x^2+3*x-72 = 0
24*x^2+3*x-72 = 0
DELTA = 3^2-(-72*4*24)
DELTA = 6921
DELTA > 0
x = (6921^(1/2)-3)/(2*24) or x = (-6921^(1/2)-3)/(2*24)
x = (3*769^(1/2)-3)/48 or x = (-3*769^(1/2)-3)/48
x in { (-3*769^(1/2)-3)/48, (3*769^(1/2)-3)/48}
x in { (-3*769^(1/2)-3)/48, (3*769^(1/2)-3)/48 }
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