(y/3)2=4

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Solution for (y/3)2=4 equation: 


y in (-oo:+oo)

(y/3)^2 = 4 // - 4

(y/3)^2-4 = 0

1/9*y^2 = 4 // : 1/9

y^2 = 36

y^2 = 36 // ^ 1/2

abs(y) = 6

y = 6 or y = -6

y in { 6, -6 }

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