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D( a )
a-2 = 0
a-2 = 0
a-2 = 0
a-2 = 0 // + 2
a = 2
a in (-oo:2) U (2:+oo)
(a^2-(3*a)-7)/(a-2) = 0
(a^2-3*a-7)/(a-2) = 0
a^2-3*a-7 = 0
a^2-3*a-7 = 0
DELTA = (-3)^2-(-7*1*4)
DELTA = 37
DELTA > 0
a = (37^(1/2)+3)/(1*2) or a = (3-37^(1/2))/(1*2)
a = (37^(1/2)+3)/2 or a = (3-37^(1/2))/2
(a-((3-37^(1/2))/2))*(a-((37^(1/2)+3)/2)) = 0
((a-((3-37^(1/2))/2))*(a-((37^(1/2)+3)/2)))/(a-2) = 0
( a-((3-37^(1/2))/2) )
a-((3-37^(1/2))/2) = 0 // + (3-37^(1/2))/2
a = (3-37^(1/2))/2
( a-((37^(1/2)+3)/2) )
a-((37^(1/2)+3)/2) = 0 // + (37^(1/2)+3)/2
a = (37^(1/2)+3)/2
a in { (3-37^(1/2))/2, (37^(1/2)+3)/2 }
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