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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x)/5 = 41/x // - 41/x
(6*x)/5-(41/x) = 0
(6*x)/5-41*x^-1 = 0
6/5*x^1-41*x^-1 = 0
(6/5*x^2-41*x^0)/(x^1) = 0 // * x^2
x^1*(6/5*x^2-41*x^0) = 0
x^1
(6/5)*x^2-41 = 0
(6/5)*x^2-41 = 0
DELTA = 0^2-(-41*4*(6/5))
DELTA = 984/5
DELTA > 0
x = ((984/5)^(1/2)+0)/(2*(6/5)) or x = (0-(984/5)^(1/2))/(2*(6/5))
x = 5/12*(984/5)^(1/2) or x = 5/12*(984/5)^(1/2)
x in { 5/12*(984/5)^(1/2), 5/12*(984/5)^(1/2)}
x in { 5/12*(984/5)^(1/2), 5/12*(984/5)^(1/2) }
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