1/2l^2+9l=0

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Solution for 1/2l^2+9l=0 equation: 


l in (-oo:+oo)

(1/2)*l^2+9*l = 0

1/2*l^2+9*l = 0

DELTA = 9^2-(0*1/2*4)

DELTA = 81

DELTA > 0

l = (81^(1/2)-9)/(1/2*2) or l = (-81^(1/2)-9)/(1/2*2)

l = 0 or l = -18

l in { -18, 0 }

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