4/9=k^2

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Solution for 4/9=k^2 equation: 


k in (-oo:+oo)

4/9 = k^2 // - k^2

4/9-k^2 = 0

-1*k^2 = -4/9 // : -1

k^2 = 4/9

k^2 = 4/9 // ^ 1/2

abs(k) = 2/3

k = 2/3 or k = -2/3

k in { 2/3, -2/3 }

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