- A−2 < m < 3
- Bm < −2 or m > 3
- C−3 < m < 2
- Dm > 3
Step-by-Step Solution
An upward parabola stays positive when its discriminant is negative: , i.e. , so −.
Answer: A) −2 < m < 3
For which values of is positive for every real ?
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