y2-25/5-y

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Solution for y2-25/5-y equation: 


y in (-oo:+oo)

y^2-y-(25/5) = 0

y^2-y-5 = 0

y^2-y-5 = 0

DELTA = (-1)^2-(-5*1*4)

DELTA = 21

DELTA > 0

y = (21^(1/2)+1)/(1*2) or y = (1-21^(1/2))/(1*2)

y = (21^(1/2)+1)/2 or y = (1-21^(1/2))/2

y in { (1-21^(1/2))/2, (21^(1/2)+1)/2 }

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