x^2/2=64

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Solution for x^2/2=64 equation: 


x in (-oo:+oo)

(x^2)/2 = 64 // - 64

(x^2)/2-64 = 0

1/2*x^2 = 64 // : 1/2

x^2 = 128

x^2 = 128 // ^ 1/2

abs(x) = 8*2^(1/2)

x = 8*2^(1/2) or x = -(8*2^(1/2))

x in { 8*2^(1/2), -(8*2^(1/2)) }

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