Question

2x²+x-1=0
1²-4.2.(-1)
1+8=9

1+-√9
2.2

1+-3
4

1+3=4/4=1
1-3=-2/4=0,5
ta certo ?

Answer 1

Quase certo, errou no sinal x'= -1 e x"= 0,5