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D( l )
l-4 = 0
l-4 = 0
l-4 = 0
l-4 = 0 // + 4
l = 4
l in (-oo:4) U (4:+oo)
96/(l-4) = l // - l
96/(l-4)-l = 0
96/(l-4)+(-l*(l-4))/(l-4) = 0
96-l*(l-4) = 0
4*l-l^2+96 = 0
4*l-l^2+96 = 0
4*l-l^2+96 = 0
DELTA = 4^2-(-1*4*96)
DELTA = 400
DELTA > 0
l = (400^(1/2)-4)/(-1*2) or l = (-400^(1/2)-4)/(-1*2)
l = -8 or l = 12
(l+8)*(l-12) = 0
((l+8)*(l-12))/(l-4) = 0
((l+8)*(l-12))/(l-4) = 0 // * l-4
(l+8)*(l-12) = 0
( l+8 )
l+8 = 0 // - 8
l = -8
( l-12 )
l-12 = 0 // + 12
l = 12
l in { -8, 12 }
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