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D( a )
2*a = 0
a^2-(5*a) = 0
2*a = 0
2*a = 0
2*a = 0 // : 2
a = 0
a^2-(5*a) = 0
a^2-(5*a) = 0
a^2-5*a = 0
a^2-5*a = 0
DELTA = (-5)^2-(0*1*4)
DELTA = 25
DELTA > 0
a = (25^(1/2)+5)/(1*2) or a = (5-25^(1/2))/(1*2)
a = 5 or a = 0
a in (-oo:0) U (0:5) U (5:+oo)
(3*a^2*((a^2+4*a)/(2*a)))/(a^2-(5*a)) = 0
(3*a^2*((a^2+4*a)/(2*a)))/(a^2-5*a) = 0
(3*a^2*(a^2+4*a))/(2*a*(a^2-5*a)) = 0
a^2+4*a = 0
a*(a+4) = 0
a+4 = 0 // - 4
a = -4
a*(a+4) = 0
a^2-5*a = 0
a*(a-5) = 0
a-5 = 0 // + 5
a = 5
a*(a-5) = 0
(3*a*a^2*(a+4))/(2*a*a*(a-5)) = 0
( 3*a^2 )
3*a^2 = 0 // : 3
a^2 = 0
a = 0
( a+4 )
a+4 = 0 // - 4
a = -4
( a )
a = 0
a in { 0}
a = -4
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