a^2/4=8

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Solution for a^2/4=8 equation: 


a in (-oo:+oo)

(a^2)/4 = 8 // - 8

(a^2)/4-8 = 0

1/4*a^2 = 8 // : 1/4

a^2 = 32

a^2 = 32 // ^ 1/2

abs(a) = 4*2^(1/2)

a = 4*2^(1/2) or a = -(4*2^(1/2))

a in { 4*2^(1/2), -(4*2^(1/2)) }

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