The given quadratic is x2 - 4x - 12.

The first term, x2, has factors x and x.

The last term, -12, factors in many ways -- for example, as (-3).4, 12.(-1) and (-6) . 2, among others. Trying the first gives

The second gives

The third gives

Enter this as (x - 6)*(x + 2)


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