Question

Alguém pode resolver ?

Answer 1

Resposta:

S={-3/10,-3/8}

Explicação passo-a-passo:

(×+3)²=9².ײ

(×+3).(×+3)=81ײ

ײ+3×+3×+9=81ײ

ײ+6×+9=81ײ

ײ-81ײ+6×+9=0

-80ײ+6×+9=0

∆=6²-4.(-80).9

∆=36+2880

∆=2916

×=-6±√2916/2.80

×=-6±54/160

×'=-6+54/160=-48/160 :(16)=-3/10

×"=-6-54/160=-60/160 :(10)=-6/16 :(2)=-3/8