9/20=x^2

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Solution for 9/20=x^2 equation: 


x in (-oo:+oo)

9/20 = x^2 // - x^2

9/20-x^2 = 0

-1*x^2 = -9/20 // : -1

x^2 = 9/20

x^2 = 9/20 // ^ 1/2

abs(x) = (9/20)^(1/2)

x = (9/20)^(1/2) or x = -(9/20)^(1/2)

x in { (9/20)^(1/2), -(9/20)^(1/2) }

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