y^2-2/3y+25=81

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Solution for y^2-2/3y+25=81 equation: 


y in (-oo:+oo)

y^2-((2/3)*y)+25 = 81 // - 81

y^2-((2/3)*y)-81+25 = 0

y^2+(-2/3)*y-81+25 = 0

y^2-2/3*y-56 = 0

DELTA = (-2/3)^2-(-56*1*4)

DELTA = 2020/9

DELTA > 0

y = ((2020/9)^(1/2)+2/3)/(1*2) or y = (2/3-(2020/9)^(1/2))/(1*2)

y = ((2020/9)^(1/2)+2/3)/2 or y = (2/3-(2020/9)^(1/2))/2

y in { (2/3-(2020/9)^(1/2))/2, ((2020/9)^(1/2)+2/3)/2 }

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