2x2 - 5x + 12 does not factor.
2x2 - 5x - 12 factors into (2x + 3)(x - 4)
2x2 + 5x - 12 factors into (2x - 3)(x + 4)
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(x + 12)(x - 8)
(3x - 4)(4x - 3)
The expression x2 + 1x - 12 can be factored out as (x - 3)(x + 4)
Depending on the missing operational sign, that's 2(x plus or minus 6)
(n - 4)(n - 12)