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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
5 = 3*x-(1/(4*x)) // - 3*x-(1/(4*x))
1/(4*x)-(3*x)+5 = 0
1/(4*x)-3*x+5 = 0
1/4*x^-1-3*x^1+5*x^0 = 0
(5*x^1-3*x^2+1/4*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^1-3*x^2+1/4*x^0) = 0
x^1
5*x-3*x^2+1/4 = 0
5*x-3*x^2+1/4 = 0
DELTA = 5^2-(-3*4*(1/4))
DELTA = 28
DELTA > 0
x = (28^(1/2)-5)/(-3*2) or x = (-28^(1/2)-5)/(-3*2)
x = (2*7^(1/2)-5)/(-6) or x = (-2*7^(1/2)-5)/(-6)
x in { (2*7^(1/2)-5)/(-6), (-2*7^(1/2)-5)/(-6)}
x in { (2*7^(1/2)-5)/(-6), (-2*7^(1/2)-5)/(-6) }
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