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D( a )
a-2 = 0
a = 0
a-2 = 0
a-2 = 0
a-2 = 0 // + 2
a = 2
a = 0
a = 0
a in (-oo:0) U (0:2) U (2:+oo)
5/(a-2) = 1-4/a // - 1-4/a
5/(a-2)-(-4/a)-1 = 0
5/(a-2)+4*a^-1-1 = 0
5/(a-2)+4/a-1 = 0
(5*a)/(a*(a-2))+(4*(a-2))/(a*(a-2))+(-1*a*(a-2))/(a*(a-2)) = 0
4*(a-2)-1*a*(a-2)+5*a = 0
9*a-a^2+2*a-8 = 0
11*a-a^2-8 = 0
11*a-a^2-8 = 0
11*a-a^2-8 = 0
DELTA = 11^2-(-8*(-1)*4)
DELTA = 89
DELTA > 0
a = (89^(1/2)-11)/(-1*2) or a = (-89^(1/2)-11)/(-1*2)
a = (89^(1/2)-11)/(-2) or a = (89^(1/2)+11)/2
(a-((89^(1/2)-11)/(-2)))*(a-((89^(1/2)+11)/2)) = 0
((a-((89^(1/2)-11)/(-2)))*(a-((89^(1/2)+11)/2)))/(a*(a-2)) = 0
((a-((89^(1/2)-11)/(-2)))*(a-((89^(1/2)+11)/2)))/(a*(a-2)) = 0 // * a*(a-2)
(a-((89^(1/2)-11)/(-2)))*(a-((89^(1/2)+11)/2)) = 0
( a-((89^(1/2)+11)/2) )
a-((89^(1/2)+11)/2) = 0 // + (89^(1/2)+11)/2
a = (89^(1/2)+11)/2
( a-((89^(1/2)-11)/(-2)) )
a-((89^(1/2)-11)/(-2)) = 0 // + (89^(1/2)-11)/(-2)
a = (89^(1/2)-11)/(-2)
a in { (89^(1/2)+11)/2, (89^(1/2)-11)/(-2) }
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