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