(y/5)^2=16

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Solution for (y/5)^2=16 equation: 


y in (-oo:+oo)

(y/5)^2 = 16 // - 16

(y/5)^2-16 = 0

1/25*y^2 = 16 // : 1/25

y^2 = 400

y^2 = 400 // ^ 1/2

abs(y) = 20

y = 20 or y = -20

y in { 20, -20 }

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