((y/7)^2)((y/7)^2)=1

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Solution for ((y/7)^2)((y/7)^2)=1 equation: 


y in (-oo:+oo)

(y/7)^2*(y/7)^2 = 1 // - 1

(y/7)^2*(y/7)^2-1 = 0

1/2401*y^4 = 1 // : 1/2401

y^4 = 2401

y^4 = 2401 // ^ 1/4

abs(y) = 7

y = 7 or y = -7

y in { 7, -7 }

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