(y/2)^2=81

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Solution for (y/2)^2=81 equation: 


y in (-oo:+oo)

(y/2)^2 = 81 // - 81

(y/2)^2-81 = 0

1/4*y^2 = 81 // : 1/4

y^2 = 324

y^2 = 324 // ^ 1/2

abs(y) = 18

y = 18 or y = -18

y in { 18, -18 }

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