(2x-4)/(4-x^2)

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Solution for (2x-4)/(4-x^2) equation: 


D( x )

4-x^2 = 0

4-x^2 = 0

4-x^2 = 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)

(2*x-4)/(4-x^2) = 0

2*x-4 = 0 // + 4

2*x = 4 // : 2

x = 4/2

x = 2

x in { 2} 

x belongs to the empty set

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