3y^2/3y+12y/3y-21/3y

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Solution for 3y^2/3y+12y/3y-21/3y equation: 


y in (-oo:+oo)

y*((3*y^2)/3)+((12*y)/3)*y-((21/3)*y) = 0

y*((3*y^2)/3)+((12*y)/3)*y-7*y = 0

y^3+4*y^2-7*y = 0

y*(y^2+4*y-7) = 0

y^2+4*y-7 = 0

DELTA = 4^2-(-7*1*4)

DELTA = 44

DELTA > 0

y = (44^(1/2)-4)/(1*2) or y = (-44^(1/2)-4)/(1*2)

y = (2*11^(1/2)-4)/2 or y = (-2*11^(1/2)-4)/2

y = 0

y = 0

y in { (-2*11^(1/2)-4)/2, (2*11^(1/2)-4)/2, 0 }

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