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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/a-a-(3/4)-4 = 0
9/a-a-3/4-4 = 0
9*a^-1-1*a^1-19/4*a^0 = 0
(9*a^0-1*a^2-19/4*a^1)/(a^1) = 0 // * a^2
a^1*(9*a^0-1*a^2-19/4*a^1) = 0
a^1
(-19/4)*a-a^2+9 = 0
(-19/4)*a-a^2+9 = 0
DELTA = (-19/4)^2-(-1*4*9)
DELTA = 937/16
DELTA > 0
a = ((937/16)^(1/2)-(-19/4))/(-1*2) or a = (-(-19/4)-(937/16)^(1/2))/(-1*2)
a = ((937/16)^(1/2)+19/4)/(-2) or a = (19/4-(937/16)^(1/2))/(-2)
a in { ((937/16)^(1/2)+19/4)/(-2), (19/4-(937/16)^(1/2))/(-2)}
a in { ((937/16)^(1/2)+19/4)/(-2), (19/4-(937/16)^(1/2))/(-2) }
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