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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = x/16 // - x/16
9/x-(x/16) = 0
9*x^-1-1/16*x^1 = 0
(9*x^0-1/16*x^2)/(x^1) = 0 // * x^2
x^1*(9*x^0-1/16*x^2) = 0
x^1
(-1/16)*x^2+9 = 0
(-1/16)*x^2+9 = 0
DELTA = 0^2-(4*9*(-1/16))
DELTA = 9/4
DELTA > 0
x = ((9/4)^(1/2)+0)/(2*(-1/16)) or x = (0-(9/4)^(1/2))/(2*(-1/16))
x = -12 or x = 12
x in { -12, 12}
x in { -12, 12 }
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