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D( a )
3*a+9 = 0
3*a+9 = 0
3*a+9 = 0
3*a+9 = 0 // - 9
3*a = -9 // : 3
a = -9/3
a = -3
a in (-oo:-3) U (-3:+oo)
(a^2-(24*a)+10)/(3*a+9) = 0
(a^2-24*a+10)/(3*a+9) = 0
a^2-24*a+10 = 0
a^2-24*a+10 = 0
DELTA = (-24)^2-(1*4*10)
DELTA = 536
DELTA > 0
a = (536^(1/2)+24)/(1*2) or a = (24-536^(1/2))/(1*2)
a = (2*134^(1/2)+24)/2 or a = (24-2*134^(1/2))/2
(a-((24-2*134^(1/2))/2))*(a-((2*134^(1/2)+24)/2)) = 0
((a-((24-2*134^(1/2))/2))*(a-((2*134^(1/2)+24)/2)))/(3*a+9) = 0
( a-((2*134^(1/2)+24)/2) )
a-((2*134^(1/2)+24)/2) = 0 // + (2*134^(1/2)+24)/2
a = (2*134^(1/2)+24)/2
( a-((24-2*134^(1/2))/2) )
a-((24-2*134^(1/2))/2) = 0 // + (24-2*134^(1/2))/2
a = (24-2*134^(1/2))/2
a in { (2*134^(1/2)+24)/2, (24-2*134^(1/2))/2 }
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