(2x-4)/(x^2-9)=0

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Solution for (2x-4)/(x^2-9)=0 equation: 


D( x )

x^2-9 = 0

x^2-9 = 0

x^2-9 = 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)

(2*x-4)/(x^2-9) <= 0

( 2*x-4 )

2*x-4 <= 0 // + 4

2*x <= 4 // : 2

x <= 4/2

x <= 2

( x^2-9 )

1*x^2 <= 9

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

x^2 <= 9/1

x^2 <= 9

x^2 <= 9 // ^ 1/2

abs(x) <= 3

x in <-3:3>

	(-oo:-3)	(-3:2)	(2:3)	(3:+oo)
2*x-4	-	-	+	+
x^2-9	+	-	-	+


x in (-oo:-3) U <2:3)

(-oo:-3) U <2:3)

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