2
advanced-mathSolve:
A
or
B
C
D
Correct Answer: A
Choice A is the correct answer.
- Roots: and .
- Direction: The leading term is (positive), so it opens upward.
- Inequality: We want (above the axis).
- Region: For an upward parabola, positive values are on the "outside" tails.
- Solution: or .
Choice B is incorrect because that is where it is negative (between roots). Choice C is incorrect because it misses the left tail. Choice D is incorrect because it misses the right tail.