-10r^2+20r^3-26r^2+1r+7/-2r

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Solution for -10r^2+20r^3-26r^2+1r+7/-2r equation: 


r in (-oo:+oo)

20*r^3-10*r^2-(26*r^2)+1*r+(7/(-2))*r = 0

20*r^3-10*r^2-26*r^2+r+(7/(-2))*r = 0

20*r^3-36*r^2-5/2*r = 0

r*(20*r^2-36*r-5/2) = 0

20*r^2-36*r-5/2 = 0

DELTA = (-36)^2-(-5/2*4*20)

DELTA = 1496

DELTA > 0

r = (1496^(1/2)+36)/(2*20) or r = (36-1496^(1/2))/(2*20)

r = (2*374^(1/2)+36)/40 or r = (36-2*374^(1/2))/40

r = 0

r = 0

r in { (36-2*374^(1/2))/40, (2*374^(1/2)+36)/40, 0 }

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