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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
648000/y-(20*y) = 3000 // - 3000
648000/y-(20*y)-3000 = 0
648000/y-20*y-3000 = 0
648000*y^-1-20*y^1-3000*y^0 = 0
(648000*y^0-20*y^2-3000*y^1)/(y^1) = 0 // * y^2
y^1*(648000*y^0-20*y^2-3000*y^1) = 0
y^1
648000-20*y^2-3000*y = 0
648000-20*y^2-3000*y = 0
DELTA = (-3000)^2-(-20*4*648000)
DELTA = 60840000
DELTA > 0
y = (60840000^(1/2)+3000)/(-20*2) or y = (3000-60840000^(1/2))/(-20*2)
y = -270 or y = 120
y in { -270, 120}
y in { -270, 120 }
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