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D( a )
2-(4*a) = 0
2-(4*a) = 0
2-(4*a) = 0
2-4*a = 0
2-4*a = 0 // - 2
-4*a = -2 // : -4
a = -2/(-4)
a = 1/2
a in (-oo:1/2) U (1/2:+oo)
-((2.5-(3*a))/(2-(4*a)))-a-5.5 = 0
-((2.5-3*a)/(2-4*a))-a-5.5 = 0
(-1*(2.5-3*a))/(2-4*a)-a-5.5 = 0
(-1*(2.5-3*a))/(2-4*a)+(-a*(2-4*a))/(2-4*a)+(-5.5*(2-4*a))/(2-4*a) = 0
-1*(2.5-3*a)-a*(2-4*a)-5.5*(2-4*a) = 0
4*a^2+a+22*a-11-2.5 = 0
4*a^2+23*a-13.5 = 0
4*a^2+23*a-13.5 = 0
4*a^2+23*a-13.5 = 0
DELTA = 23^2-(-13.5*4*4)
DELTA = 745
DELTA > 0
a = (745^(1/2)-23)/(2*4) or a = (-745^(1/2)-23)/(2*4)
a = (745^(1/2)-23)/8 or a = (-(745^(1/2)+23))/8
(a+(745^(1/2)+23)/8)*(a-((745^(1/2)-23)/8)) = 0
((a+(745^(1/2)+23)/8)*(a-((745^(1/2)-23)/8)))/(2-4*a) = 0
((a+(745^(1/2)+23)/8)*(a-((745^(1/2)-23)/8)))/(2-4*a) = 0 // * 2-4*a
(a+(745^(1/2)+23)/8)*(a-((745^(1/2)-23)/8)) = 0
( a+(745^(1/2)+23)/8 )
a+(745^(1/2)+23)/8 = 0 // - (745^(1/2)+23)/8
a = -((745^(1/2)+23)/8)
( a-((745^(1/2)-23)/8) )
a-((745^(1/2)-23)/8) = 0 // + (745^(1/2)-23)/8
a = (745^(1/2)-23)/8
a in { -((745^(1/2)+23)/8), (745^(1/2)-23)/8 }
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