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D( a )
a-2 = 0
a^2-4 = 0
a-2 = 0
a-2 = 0
a-2 = 0 // + 2
a = 2
a^2-4 = 0
a^2-4 = 0
1*a^2 = 4 // : 1
a^2 = 4
a^2 = 4 // ^ 1/2
abs(a) = 2
a = 2 or a = -2
a in (-oo:-2) U (-2:2) U (2:+oo)
(a+5)/(a-2)-((5*a+18)/(a^2-4)) = 0
(a+5)/(a-2)+(-1*(5*a+18))/(a^2-4) = 0
((a+5)*(a^2-4))/((a-2)*(a^2-4))+(-1*(5*a+18)*(a-2))/((a-2)*(a^2-4)) = 0
(a+5)*(a^2-4)-1*(5*a+18)*(a-2) = 0
a^3-12*a+16 = 0
a^3-12*a+16 = 0
a^3-12*a+16 = 0
{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16 }
1
a = 1
a^3-12*a+16 = 5
1
-1
a = -1
a^3-12*a+16 = 27
-1
2
a = 2
a^3-12*a+16 = 0
2
a-2
a^2+2*a-8
a^3-12*a+16
a-2
2*a^2-a^3
2*a^2-12*a+16
4*a-2*a^2
16-8*a
8*a-16
0
a^2+2*a-8 = 0
DELTA = 2^2-(-8*1*4)
DELTA = 36
DELTA > 0
a = (36^(1/2)-2)/(1*2) or a = (-36^(1/2)-2)/(1*2)
a = 2 or a = -4
a in { -4, 2, 2}
(a+4)*(a-2)^2 = 0
((a+4)*(a-2)^2)/((a-2)*(a^2-4)) = 0
((a+4)*(a-2)^2)/((a-2)*(a^2-4)) = 0 // * (a-2)*(a^2-4)
(a+4)*(a-2)^2 = 0
( a+4 )
a+4 = 0 // - 4
a = -4
( a-2 )
a-2 = 0 // + 2
a = 2
a in { 2}
a = -4
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