y^2/30-y/15-1/2=0

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Solution for y^2/30-y/15-1/2=0 equation: 


y in (-oo:+oo)

(y^2)/30-(y/15)-(1/2) = 0

(y^2)/30-(y/15)-1/2 = 0

1/30*y^2-1/15*y-1/2 = 0

DELTA = (-1/15)^2-(-1/2*1/30*4)

DELTA = 16/225

DELTA > 0

y = ((16/225)^(1/2)+1/15)/(1/30*2) or y = (1/15-(16/225)^(1/2))/(1/30*2)

y = 5 or y = -3

y in { -3, 5 }

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