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D( x )
(x-2)^2 = 0
(x-2)^2 = 0
(x-2)^2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
115 = (2*x)/((x-2)^2) // - (2*x)/((x-2)^2)
115-((2*x)/((x-2)^2)) = 0
115-2*x*(x-2)^-2 = 0
(-2*x)/((x-2)^2)+115 = 0
(-2*x)/((x-2)^2)+(115*(x-2)^2)/((x-2)^2) = 0
115*(x-2)^2-2*x = 0
115*x^2-462*x+460 = 0
115*x^2-462*x+460 = 0
115*x^2-462*x+460 = 0
DELTA = (-462)^2-(4*115*460)
DELTA = 1844
DELTA > 0
x = (1844^(1/2)+462)/(2*115) or x = (462-1844^(1/2))/(2*115)
x = (2*461^(1/2)+462)/230 or x = (462-2*461^(1/2))/230
(x-((462-2*461^(1/2))/230))*(x-((2*461^(1/2)+462)/230)) = 0
((x-((462-2*461^(1/2))/230))*(x-((2*461^(1/2)+462)/230)))/((x-2)^2) = 0
((x-((462-2*461^(1/2))/230))*(x-((2*461^(1/2)+462)/230)))/((x-2)^2) = 0 // * (x-2)^2
(x-((462-2*461^(1/2))/230))*(x-((2*461^(1/2)+462)/230)) = 0
( x-((2*461^(1/2)+462)/230) )
x-((2*461^(1/2)+462)/230) = 0 // + (2*461^(1/2)+462)/230
x = (2*461^(1/2)+462)/230
( x-((462-2*461^(1/2))/230) )
x-((462-2*461^(1/2))/230) = 0 // + (462-2*461^(1/2))/230
x = (462-2*461^(1/2))/230
x in { (2*461^(1/2)+462)/230, (462-2*461^(1/2))/230 }
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