3/7y^2+5/7y=8/7

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Solution for 3/7y^2+5/7y=8/7 equation: 


y in (-oo:+oo)

(3/7)*y^2+(5/7)*y = 8/7 // - 8/7

(3/7)*y^2+(5/7)*y-(8/7) = 0

(3/7)*y^2+(5/7)*y-8/7 = 0

3/7*y^2+5/7*y-8/7 = 0

DELTA = (5/7)^2-(-8/7*3/7*4)

DELTA = 121/49

DELTA > 0

y = ((121/49)^(1/2)-5/7)/(3/7*2) or y = (-(121/49)^(1/2)-5/7)/(3/7*2)

y = 1 or y = -8/3

y in { -8/3, 1 }

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