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Omni-MATH / For some integers m and n, the expression (x+m)(x+n) is equal to a quadratic expression in x with a constant term of -12. Which of the following cannot be a value of m?

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problem

For some integers mm and nn, the expression (x+m)(x+n)(x+m)(x+n) is equal to a quadratic expression in xx with a constant term of -12. Which of the following cannot be a value of mm?
Plain-text mathematical notation (without MathML)
For some integers m and n, the expression (x+m)(x+n) is equal to a quadratic expression in x with a constant term of -12. Which of the following cannot be a value of m?
Original LaTeX notation
For some integers $m$ and $n$, the expression $(x+m)(x+n)$ is equal to a quadratic expression in $x$ with a constant term of -12. Which of the following cannot be a value of $m$?

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