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