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D( x )
x^2-4 = 0
x^2-4 = 0
x^2-4 = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in (-oo:-2) U (-2:2) U (2:+oo)
-16 = (9*x)/(x^2-4) // - (9*x)/(x^2-4)
-((9*x)/(x^2-4))-16 = 0
-9*x*(x^2-4)^-1-16 = 0
(-9*x)/(x^2-4)-16 = 0
(-9*x)/(x^2-4)+(-16*(x^2-4))/(x^2-4) = 0
-16*(x^2-4)-9*x = 0
64-16*x^2-9*x = 0
64-16*x^2-9*x = 0
64-16*x^2-9*x = 0
DELTA = (-9)^2-(-16*4*64)
DELTA = 4177
DELTA > 0
x = (4177^(1/2)+9)/(-16*2) or x = (9-4177^(1/2))/(-16*2)
x = (4177^(1/2)+9)/(-32) or x = (9-4177^(1/2))/(-32)
(x-((4177^(1/2)+9)/(-32)))*(x-((9-4177^(1/2))/(-32))) = 0
((x-((4177^(1/2)+9)/(-32)))*(x-((9-4177^(1/2))/(-32))))/(x^2-4) = 0
((x-((4177^(1/2)+9)/(-32)))*(x-((9-4177^(1/2))/(-32))))/(x^2-4) = 0 // * x^2-4
(x-((4177^(1/2)+9)/(-32)))*(x-((9-4177^(1/2))/(-32))) = 0
( x-((4177^(1/2)+9)/(-32)) )
x-((4177^(1/2)+9)/(-32)) = 0 // + (4177^(1/2)+9)/(-32)
x = (4177^(1/2)+9)/(-32)
( x-((9-4177^(1/2))/(-32)) )
x-((9-4177^(1/2))/(-32)) = 0 // + (9-4177^(1/2))/(-32)
x = (9-4177^(1/2))/(-32)
x in { (4177^(1/2)+9)/(-32), (9-4177^(1/2))/(-32) }
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