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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(x^2)-(7*x)-18 = x+(6*x)/(x^2)-2 // - x+(6*x)/(x^2)-2
(2*x)/(x^2)-(7*x)-x-((6*x)/(x^2))-18+2 = 0
(2*x)/(x^2)-7*x-x-6*x^-1-18+2 = 0
-8*x^1-4*x^-1-16*x^0 = 0
(-8*x^2-16*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(-8*x^2-16*x^1-4*x^0) = 0
x^1
-8*x^2-16*x-4 = 0
-8*x^2-16*x-4 = 0
DELTA = (-16)^2-(-8*(-4)*4)
DELTA = 128
DELTA > 0
x = (128^(1/2)+16)/(-8*2) or x = (16-128^(1/2))/(-8*2)
x = (8*2^(1/2)+16)/(-16) or x = (16-8*2^(1/2))/(-16)
x in { (8*2^(1/2)+16)/(-16), (16-8*2^(1/2))/(-16)}
x in { (8*2^(1/2)+16)/(-16), (16-8*2^(1/2))/(-16) }
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