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D( x )
5*x-3 = 0
5*x-3 = 0
5*x-3 = 0
5*x-3 = 0 // + 3
5*x = 3 // : 5
x = 3/5
x in (-oo:3/5) U (3/5:+oo)
(15*x^2-(34*x)-18)/(5*x-3) = 0
(15*x^2-34*x-18)/(5*x-3) = 0
15*x^2-34*x-18 = 0
15*x^2-34*x-18 = 0
DELTA = (-34)^2-(-18*4*15)
DELTA = 2236
DELTA > 0
x = (2236^(1/2)+34)/(2*15) or x = (34-2236^(1/2))/(2*15)
x = (2*559^(1/2)+34)/30 or x = (34-2*559^(1/2))/30
(x-((34-2*559^(1/2))/30))*(x-((2*559^(1/2)+34)/30)) = 0
((x-((34-2*559^(1/2))/30))*(x-((2*559^(1/2)+34)/30)))/(5*x-3) = 0
( x-((2*559^(1/2)+34)/30) )
x-((2*559^(1/2)+34)/30) = 0 // + (2*559^(1/2)+34)/30
x = (2*559^(1/2)+34)/30
( x-((34-2*559^(1/2))/30) )
x-((34-2*559^(1/2))/30) = 0 // + (34-2*559^(1/2))/30
x = (34-2*559^(1/2))/30
x in { (2*559^(1/2)+34)/30, (34-2*559^(1/2))/30 }
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