(4-x^2)/(20-10x)

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Solution for (4-x^2)/(20-10x) equation: 


D( x )

20-(10*x) = 0

20-(10*x) = 0

20-(10*x) = 0

20-10*x = 0

20-10*x = 0 // - 20

-10*x = -20 // : -10

x = -20/(-10)

x = 2

x in (-oo:2) U (2:+oo)

(4-x^2)/(20-(10*x)) = 0

(4-x^2)/(20-10*x) = 0

-1*x^2 = -4 // : -1

x^2 = 4

x^2 = 4 // ^ 1/2

abs(x) = 2

x = 2 or x = -2

x in { 2} 

x = -2

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