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D( x )
16-((x^2)/5) = 0
16-((x^2)/5) = 0
16-((x^2)/5) = 0
-1/5*x^2 = -16 // : -1/5
x^2 = 80
x^2 = 80 // ^ 1/2
abs(x) = 4*5^(1/2)
x = 4*5^(1/2) or x = -(4*5^(1/2))
x in (-oo:-(4*5^(1/2))) U (-(4*5^(1/2)):4*5^(1/2)) U (4*5^(1/2):+oo)
(12-(((3*x)/20)*x))/(16-((x^2)/5)) = 0
((-3/20)*x^2+12)/(16-((x^2)/5)) = 0
(12-3/20*x^2)/(16-1/5*x^2) = 0
-3/20*x^2 = -12 // : -3/20
x^2 = 80
x^2 = 80 // ^ 1/2
abs(x) = 4*5^(1/2)
x = 4*5^(1/2) or x = -(4*5^(1/2))
x in { 4*5^(1/2)}
x in { -(4*5^(1/2))}
x belongs to the empty set
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