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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9*(a+9)-(4/a)+8 = 0
9*(a+9)-4*a^-1+8 = 0
9*(a+9)-4/a+8 = 0
(9*a*(a+9))/a-4/a+(8*a)/a = 0
9*a*(a+9)+8*a-4 = 0
9*a^2+81*a+8*a-4 = 0
9*a^2+89*a-4 = 0
9*a^2+89*a-4 = 0
9*a^2+89*a-4 = 0
DELTA = 89^2-(-4*4*9)
DELTA = 8065
DELTA > 0
a = (8065^(1/2)-89)/(2*9) or a = (-8065^(1/2)-89)/(2*9)
a = (8065^(1/2)-89)/18 or a = (-(8065^(1/2)+89))/18
(a+(8065^(1/2)+89)/18)*(a-((8065^(1/2)-89)/18)) = 0
((a+(8065^(1/2)+89)/18)*(a-((8065^(1/2)-89)/18)))/a = 0
((a+(8065^(1/2)+89)/18)*(a-((8065^(1/2)-89)/18)))/a = 0 // * a
(a+(8065^(1/2)+89)/18)*(a-((8065^(1/2)-89)/18)) = 0
( a+(8065^(1/2)+89)/18 )
a+(8065^(1/2)+89)/18 = 0 // - (8065^(1/2)+89)/18
a = -((8065^(1/2)+89)/18)
( a-((8065^(1/2)-89)/18) )
a-((8065^(1/2)-89)/18) = 0 // + (8065^(1/2)-89)/18
a = (8065^(1/2)-89)/18
a in { -((8065^(1/2)+89)/18), (8065^(1/2)-89)/18 }
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