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

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

x^2-4*x^-2-9 = 0

t_1 = x^2

1*t_1^1-4*t_1^-1-9 = 0

1*t_1^1-4*t_1^-1-9*t_1^0 = 0

(1*t_1^2-9*t_1^1-4*t_1^0)/(t_1^1) = 0 // * t_1^2

t_1^1*(1*t_1^2-9*t_1^1-4*t_1^0) = 0

t_1^1

t_1^2-9*t_1-4 = 0

t_1^2-9*t_1-4 = 0

DELTA = (-9)^2-(-4*1*4)

DELTA = 97

DELTA > 0

t_1 = (97^(1/2)+9)/(1*2) or t_1 = (9-97^(1/2))/(1*2)

t_1 = (97^(1/2)+9)/2 or t_1 = (9-97^(1/2))/2

t_1 in { (9-97^(1/2))/2, (97^(1/2)+9)/2} 

t_1 = (9-97^(1/2))/2

x^2-((9-97^(1/2))/2) = 0

1*x^2 = (9-97^(1/2))/2 // : 1

x^2 = (9-97^(1/2))/2

t_1 = (97^(1/2)+9)/2

x^2-((97^(1/2)+9)/2) = 0

1*x^2 = (97^(1/2)+9)/2 // : 1

x^2 = (97^(1/2)+9)/2

x^2 = (97^(1/2)+9)/2 // ^ 1/2

abs(x) = ((97^(1/2)+9)^(1/2))/(2^(1/2))

x = ((97^(1/2)+9)^(1/2))/(2^(1/2)) or x = -(((97^(1/2)+9)^(1/2))/(2^(1/2)))

x in { ((97^(1/2)+9)^(1/2))/(2^(1/2)), -(((97^(1/2)+9)^(1/2))/(2^(1/2))) }

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