Respostas

2013-07-02T13:26:06-03:00

x^4-5x²+6=0

*x²=y

y²-5y+6=0

delta=25-24

delta=1

y=(5+/-1)/2

y1=3

y2=2

*x²=3

x=+/-\sqrt3

*x²=2

x=+/-\sqrt2

S:{\sqrt3,-\sqrt3,\sqrt2,-\sqrt2}

 

m^4=m²+12

*m²=y

y²=y+12

y²-y-12=0

delta=1+48

delta=49

y=(1+/-7)/2

y1=4

y2=-3

*m²=4

m=+/-2

*m²=-3

m não pertence aos reais

S:{2,-2}

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