n^2/4=20n

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Solution for n^2/4=20n equation: 


n in (-oo:+oo)

(n^2)/4 = 20*n // - 20*n

(n^2)/4-(20*n) = 0

(n^2)/4-20*n = 0

1/4*n^2-20*n = 0

DELTA = (-20)^2-(0*1/4*4)

DELTA = 400

DELTA > 0

n = (400^(1/2)+20)/(1/4*2) or n = (20-400^(1/2))/(1/4*2)

n = 80 or n = 0

n in { 0, 80 }

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