(15-5x)/(9-x^2)

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Solution for (15-5x)/(9-x^2) equation: 


D( x )

9-x^2 = 0

9-x^2 = 0

9-x^2 = 0

-1*x^2 = -9 // : -1

x^2 = 9

x^2 = 9 // ^ 1/2

abs(x) = 3

x = 3 or x = -3

x in (-oo:-3) U (-3:3) U (3:+oo)

(15-(5*x))/(9-x^2) = 0

(15-5*x)/(9-x^2) = 0

15-5*x = 0 // - 15

-5*x = -15 // : -5

x = -15/(-5)

x = 3

x in { 3} 

x belongs to the empty set

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