Question

como eu faço pra encontra as reprises dessas contas?​

Answer 1

Resposta:

Explicação passo a passo:

49x²=36

x²=36/49

x=V36/49

x=+6/7 ou x=-6/7

S={-6/7,+6/7}

-25x²-15x=0

-5x(5x+3)=0

-5x=0

x=0/-5

x=0

5x+3=0

5x=0-3

5x=-3

x=-3/5

S={-3/5,0}

9x²-16=0

9x²=0+16

9x²=16

x²=16/9

x=V16/9

x=+4/3

ou

x=-4/3

S={-4/3,4/3}

11x²-x=0

x(11x-1)=0

x=0

11x-1=0

11x=0+1

11x=1

x=1/11

S={0,1/11}

-x²-x+6=0

x=1+-V-1²-4.-1.6/-2

x=1+-V1+24/-2

x=1+-V25/-2

x=1+-5/-2

x'=1+5/-2=6/-2=-3

x''=1-5/-2=-4/-2=2

S={-3,2}

2x²-9x+7=0

x=9+-V-9²-4.2.7/2.2

x=9+-V81-56/4

x=9+-V25/4

x=9+-5/4

x'=9+5/4=14/4=7/2

x''=9-5/4=4/4=1

S={1,7/2}

-x²+9x-18=0

x=-9+-V9²-4.-1.-18/2.-1

x=-9+-V81-72/-2

x=-9+-V9/-2

x=-9+-3/-2

x'=-9+3/-2=-6/-2=+3

x''=-9-3/-2=-12/-2=+6

S={3,6}