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a in (-oo:+oo)
-21 = 6-((3*(-(2*a)-19)^2)/3) // - 6-((3*(-(2*a)-19)^2)/3)
(3*(-(2*a)-19)^2)/3-21-6 = 0
(3*(-2*a-19)^2)/3-21-6 = 0
(-2*a-19)^2-21-6 = 0
(-2*a-19)^2-21-6 = 0
4*a^2+76*a-6+340 = 0
4*a^2+76*a+334 = 0
4*a^2+76*a+334 = 0
2*(2*a^2+38*a+167) = 0
2*a^2+38*a+167 = 0
DELTA = 38^2-(2*4*167)
DELTA = 108
DELTA > 0
a = (108^(1/2)-38)/(2*2) or a = (-108^(1/2)-38)/(2*2)
a = (6*3^(1/2)-38)/4 or a = (-6*3^(1/2)-38)/4
2*(a-((-6*3^(1/2)-38)/4))*(a-((6*3^(1/2)-38)/4)) = 0
2*(a-((-6*3^(1/2)-38)/4))*(a-((6*3^(1/2)-38)/4)) = 0
( 2 )
2 = 0
a belongs to the empty set
( a-((-6*3^(1/2)-38)/4) )
a-((-6*3^(1/2)-38)/4) = 0 // + (-6*3^(1/2)-38)/4
a = (-6*3^(1/2)-38)/4
( a-((6*3^(1/2)-38)/4) )
a-((6*3^(1/2)-38)/4) = 0 // + (6*3^(1/2)-38)/4
a = (6*3^(1/2)-38)/4
a in { (-6*3^(1/2)-38)/4, (6*3^(1/2)-38)/4 }
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