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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1500/y-(2*y) = 315 // - 315
1500/y-(2*y)-315 = 0
1500/y-2*y-315 = 0
1500*y^-1-2*y^1-315*y^0 = 0
(1500*y^0-2*y^2-315*y^1)/(y^1) = 0 // * y^2
y^1*(1500*y^0-2*y^2-315*y^1) = 0
y^1
1500-2*y^2-315*y = 0
1500-2*y^2-315*y = 0
DELTA = (-315)^2-(-2*4*1500)
DELTA = 111225
DELTA > 0
y = (111225^(1/2)+315)/(-2*2) or y = (315-111225^(1/2))/(-2*2)
y = (5*4449^(1/2)+315)/(-4) or y = (315-5*4449^(1/2))/(-4)
y in { (5*4449^(1/2)+315)/(-4), (315-5*4449^(1/2))/(-4)}
y in { (5*4449^(1/2)+315)/(-4), (315-5*4449^(1/2))/(-4) }
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