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D( a )
a+4 = 0
a+4 = 0
a+4 = 0
a+4 = 0 // - 4
a = -4
a in (-oo:-4) U (-4:+oo)
(a^2-(3*a)-6)/(a+4) = 0
(a^2-3*a-6)/(a+4) = 0
a^2-3*a-6 = 0
a^2-3*a-6 = 0
DELTA = (-3)^2-(-6*1*4)
DELTA = 33
DELTA > 0
a = (33^(1/2)+3)/(1*2) or a = (3-33^(1/2))/(1*2)
a = (33^(1/2)+3)/2 or a = (3-33^(1/2))/2
(a-((3-33^(1/2))/2))*(a-((33^(1/2)+3)/2)) = 0
((a-((3-33^(1/2))/2))*(a-((33^(1/2)+3)/2)))/(a+4) = 0
( a-((3-33^(1/2))/2) )
a-((3-33^(1/2))/2) = 0 // + (3-33^(1/2))/2
a = (3-33^(1/2))/2
( a-((33^(1/2)+3)/2) )
a-((33^(1/2)+3)/2) = 0 // + (33^(1/2)+3)/2
a = (33^(1/2)+3)/2
a in { (3-33^(1/2))/2, (33^(1/2)+3)/2 }
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