If the equation (A-1) x ^ 2-4x-2 = 0 has two real roots, find the value range of A Urgent need

If the equation (A-1) x ^ 2-4x-2 = 0 has two real roots, find the value range of A Urgent need

Discriminant = 16 + 4 (A-1) * 2 > 0
16+8(a-1)>0
a-1>-2
a>-1
And A-1 is not equal to 0, that is, a is not equal to 1
In conclusion, a > - 1 and a does not = 1