15(n)=n^2-n/2

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Solution for 15(n)=n^2-n/2 equation: 


n in (-oo:+oo)

15*n = n^2-(n/2) // - n^2-(n/2)

15*n-n^2+n/2 = 0

31/2*n-n^2 = 0

DELTA = (31/2)^2-(-1*0*4)

DELTA = 961/4

DELTA > 0

n = ((961/4)^(1/2)-31/2)/(-1*2) or n = (-(961/4)^(1/2)-31/2)/(-1*2)

n = 0 or n = 31/2

n in { 0, 31/2 }

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