3.18=(3+x)(3+x)/(3-x)(3-x)

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Solution for 3.18=(3+x)(3+x)/(3-x)(3-x) equation: 


D( x )

3-x = 0

3-x = 0

3-x = 0

3-x = 0 // - 3

-x = -3 // * -1

x = 3

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

3.18 = (((x+3)*(x+3))/(3-x))*(3-x) // - (((x+3)*(x+3))/(3-x))*(3-x)

3.18-((((x+3)*(x+3))/(3-x))*(3-x)) = 0

3.18-(x+3)^2 = 0

3.18-1*(x+3)^2 = 0

3.18-1*(x+3)^2 = 0

-x^2-6*x-5.82 = 0

-x^2-6*x-5.82 = 0

-1*(x^2+6*x+5.82) = 0

x^2+6*x+5.82 = 0

DELTA = 6^2-(1*4*5.82)

DELTA = 12.72

DELTA > 0

x = (12.72^(1/2)-6)/(1*2) or x = (-12.72^(1/2)-6)/(1*2)

x = (12.72^(1/2)-6)/2 or x = (-(12.72^(1/2)+6))/2

-1*(x+(12.72^(1/2)+6)/2)*(x-((12.72^(1/2)-6)/2)) = 0

-1*(x+(12.72^(1/2)+6)/2)*(x-((12.72^(1/2)-6)/2)) = 0

( x+(12.72^(1/2)+6)/2 )

x+(12.72^(1/2)+6)/2 = 0 // - (12.72^(1/2)+6)/2

x = -((12.72^(1/2)+6)/2)

( x-((12.72^(1/2)-6)/2) )

x-((12.72^(1/2)-6)/2) = 0 // + (12.72^(1/2)-6)/2

x = (12.72^(1/2)-6)/2

x in { -((12.72^(1/2)+6)/2), (12.72^(1/2)-6)/2 }

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