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D( a )
2*a+2 = 0
2*a+2 = 0
2*a+2 = 0
2*a+2 = 0 // - 2
2*a = -2 // : 2
a = -2/2
a = -1
a in (-oo:-1) U (-1:+oo)
(a-2)/(2*a+2) = -2*a // + -2*a
(a-2)/(2*a+2)-(-2*a) = 0
(a-2)/(2*a+2)+2*a = 0
(a-2)/(2*a+2)+(2*a*(2*a+2))/(2*a+2) = 0
2*a*(2*a+2)+a-2 = 0
4*a^2+5*a-2 = 0
4*a^2+5*a-2 = 0
4*a^2+5*a-2 = 0
DELTA = 5^2-(-2*4*4)
DELTA = 57
DELTA > 0
a = (57^(1/2)-5)/(2*4) or a = (-57^(1/2)-5)/(2*4)
a = (57^(1/2)-5)/8 or a = (-(57^(1/2)+5))/8
(a+(57^(1/2)+5)/8)*(a-((57^(1/2)-5)/8)) = 0
((a+(57^(1/2)+5)/8)*(a-((57^(1/2)-5)/8)))/(2*a+2) = 0
((a+(57^(1/2)+5)/8)*(a-((57^(1/2)-5)/8)))/(2*a+2) = 0 // * 2*a+2
(a+(57^(1/2)+5)/8)*(a-((57^(1/2)-5)/8)) = 0
( a+(57^(1/2)+5)/8 )
a+(57^(1/2)+5)/8 = 0 // - (57^(1/2)+5)/8
a = -((57^(1/2)+5)/8)
( a-((57^(1/2)-5)/8) )
a-((57^(1/2)-5)/8) = 0 // + (57^(1/2)-5)/8
a = (57^(1/2)-5)/8
a in { -((57^(1/2)+5)/8), (57^(1/2)-5)/8 }
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