Given function f (x) = loga (MX ^ 2 + (m-1) x + 1 / 4) The definition field is r, and the value range of M is obtained

Given function f (x) = loga (MX ^ 2 + (m-1) x + 1 / 4) The definition field is r, and the value range of M is obtained

There are two cases, one is m = 1, the other is m > 0, Delta