The quadratic function f (x) = x ^ 2 + (m-1) x + 1, if any x belongs to R, f (x) > 0 is constant, the range of M is obtained

The quadratic function is always greater than 0
The minimum value should also be greater than 0
That is, the whole image is above the x-axis
So he doesn't have an intersection with the x-axis
The equation f (x) = x ^ 2 + (m-1) x + 1 = 0 has no solution
So the discriminant is less than 0
(m-1)²-4

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