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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(20*x^2+23*x-7)/x-1 = 0
(20*x^2+23*x-7)/x+(-1*x)/x = 0
20*x^2+23*x-1*x-7 = 0
20*x^2+22*x-7 = 0
20*x^2+22*x-7 = 0
20*x^2+22*x-7 = 0
DELTA = 22^2-(-7*4*20)
DELTA = 1044
DELTA > 0
x = (1044^(1/2)-22)/(2*20) or x = (-1044^(1/2)-22)/(2*20)
x = (6*29^(1/2)-22)/40 or x = (-6*29^(1/2)-22)/40
(x-((-6*29^(1/2)-22)/40))*(x-((6*29^(1/2)-22)/40)) = 0
((x-((-6*29^(1/2)-22)/40))*(x-((6*29^(1/2)-22)/40)))/x = 0
((x-((-6*29^(1/2)-22)/40))*(x-((6*29^(1/2)-22)/40)))/x = 0 // * x
(x-((-6*29^(1/2)-22)/40))*(x-((6*29^(1/2)-22)/40)) = 0
( x-((-6*29^(1/2)-22)/40) )
x-((-6*29^(1/2)-22)/40) = 0 // + (-6*29^(1/2)-22)/40
x = (-6*29^(1/2)-22)/40
( x-((6*29^(1/2)-22)/40) )
x-((6*29^(1/2)-22)/40) = 0 // + (6*29^(1/2)-22)/40
x = (6*29^(1/2)-22)/40
x in { (-6*29^(1/2)-22)/40, (6*29^(1/2)-22)/40 }
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