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{x+y=2⇒ x=2-y
{4xy=3⇒ 4.(2-y ).y=3
4(2y-y²)=3
8y-4y²=3
-4y²+8y-3=0
-8 (+ ou -)√64-4.(-4)(-3) -8(+ou-)√64-48 -8(+ou-)√16
y= _____________________= _______________ = ___________
-8 -8 -8
-8(+ou-)4
y=_________= y'=-8+4=-4/-8=1/2 e y"=-8-4= -12/-8=3/2=1,5
-8
{x+y=2⇒x+1/2=2⇒x=2-1/2=4/2-1/2=3/2=1,5
x=2-3/2= 4/2-3/2=1/2
{4xy=3⇒ 4.(2-y ).y=3
4(2y-y²)=3
8y-4y²=3
-4y²+8y-3=0
-8 (+ ou -)√64-4.(-4)(-3) -8(+ou-)√64-48 -8(+ou-)√16
y= _____________________= _______________ = ___________
-8 -8 -8
-8(+ou-)4
y=_________= y'=-8+4=-4/-8=1/2 e y"=-8-4= -12/-8=3/2=1,5
-8
{x+y=2⇒x+1/2=2⇒x=2-1/2=4/2-1/2=3/2=1,5
x=2-3/2= 4/2-3/2=1/2
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