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D( a )
28*a^2-8*a^3-(24*a) = 0
28*a^2-8*a^3-(24*a) = 0
28*a^2-8*a^3-(24*a) = 0
28*a^2-8*a^3-24*a = 0
28*a^2-8*a^3-24*a = 0
4*a*(7*a-2*a^2-6) = 0
7*a-2*a^2-6 = 0
DELTA = 7^2-(-6*(-2)*4)
DELTA = 1
DELTA > 0
a = (1^(1/2)-7)/(-2*2) or a = (-1^(1/2)-7)/(-2*2)
a = 3/2 or a = 2
4*a = 0
4*a = 0 // : 4
a = 0
a in (-oo:0) U (0:3/2) U (3/2:2) U (2:+oo)
(14*a^2-12*a^3+6*a)/(28*a^2-8*a^3-(24*a)) = 0
(14*a^2-12*a^3+6*a)/(28*a^2-8*a^3-24*a) = 0
14*a^2-12*a^3+6*a = 0
2*a*(7*a-6*a^2+3) = 0
7*a-6*a^2+3 = 0
DELTA = 7^2-(-6*3*4)
DELTA = 121
DELTA > 0
a = (121^(1/2)-7)/(-6*2) or a = (-121^(1/2)-7)/(-6*2)
a = -1/3 or a = 3/2
2*a*(a+1/3)*(a-3/2) = 0
28*a^2-8*a^3-24*a = 0
4*a*(7*a-2*a^2-6) = 0
7*a-2*a^2-6 = 0
DELTA = 7^2-(-6*(-2)*4)
DELTA = 1
DELTA > 0
a = (1^(1/2)-7)/(-2*2) or a = (-1^(1/2)-7)/(-2*2)
a = 3/2 or a = 2
4*a*(a-3/2)*(a-2) = 0
(2*a*(a+1/3)*(a-3/2))/(4*a*(a-3/2)*(a-2)) = 0
( 2*a )
2*a = 0 // : 2
a = 0
( a+1/3 )
a+1/3 = 0 // - 1/3
a = -1/3
( a-3/2 )
a-3/2 = 0 // + 3/2
a = 3/2
a in { 0}
a in { 3/2}
a = -1/3
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