(x2-900)/x2

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Solution for (x2-900)/x2 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)

(x^2-900)/(x^2) = 0

1*x^2 = 900 // : 1

x^2 = 900

x^2 = 900 // ^ 1/2

abs(x) = 30

x = 30 or x = -30

x in { 30, -30 }

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