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D( n )
6*n^2+12*n = 0
6*n^2+12*n = 0
6*n^2+12*n = 0
6*n^2+12*n = 0
DELTA = 12^2-(0*4*6)
DELTA = 144
DELTA > 0
n = (144^(1/2)-12)/(2*6) or n = (-144^(1/2)-12)/(2*6)
n = 0 or n = -2
n in (-oo:-2) U (-2:0) U (0:+oo)
(9*n^2+12*n)/(6*n^2+12*n) = 0
9*n^2+12*n = 0
3*n*(3*n+4) = 0
3*n+4 = 0 // - 4
3*n = -4 // : 3
n = -4/3
3*n*(n+4/3) = 0
6*n^2+12*n = 0
6*n*(n+2) = 0
n+2 = 0 // - 2
n = -2
6*n*(n+2) = 0
(3*n*(n+4/3))/(6*n*(n+2)) = 0
( 3*n )
3*n = 0 // : 3
n = 0
( n+4/3 )
n+4/3 = 0 // - 4/3
n = -4/3
n in { 0}
n = -4/3
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