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If m is a real number and x^2+mx+4 has two distinct real roots, then what are the possible values of m? Express your answer in interval notation.

 Dec 20, 2019

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We want the discriminant to be nonnegative, so m^2 - 4 >= 0.  The solution to this inequality is (-inf,-2] U [2,inf).

 Dec 20, 2019
 #1
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Best Answer

We want the discriminant to be nonnegative, so m^2 - 4 >= 0.  The solution to this inequality is (-inf,-2] U [2,inf).

Guest Dec 20, 2019

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