(x^2-4)/(x^2+2x)

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


D( x )

x^2+2*x = 0

x^2+2*x = 0

x^2+2*x = 0

x^2+2*x = 0

DELTA = 2^2-(0*1*4)

DELTA = 4

DELTA > 0

x = (4^(1/2)-2)/(1*2) or x = (-4^(1/2)-2)/(1*2)

x = 0 or x = -2

x in (-oo:-2) U (-2:0) U (0:+oo)

(x^2-4)/(x^2+2*x) = 0

x^2+2*x = 0

x*(x+2) = 0

x+2 = 0 // - 2

x = -2

x*(x+2) = 0

(x^2-4)/(x*(x+2)) = 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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