15-x-2x^2/x^2-9

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Solution for 15-x-2x^2/x^2-9 equation: 


D( x )

x^2 = 0

x^2 = 0

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

x in (-oo:0) U (0:+oo)

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

15-x-9-2 = 0

4-x = 0 // - 4

-x = -4 // * -1

x = 4

x = 4

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