Directions
Read the following questions. Choose the right answer.
There is only ONE correct answer to each question.
The range of the function f(x) = x² + 2x − 3 is:
- [−4, ∞)
- (−∞, −4]
- [−1, ∞)
- (−∞, −1]
Show answer
Correct answer: A. [−4, ∞)
Why
Completing the square: f(x) = (x+1)² − 4, a parabola opening upward with minimum value −4 at x=−1, so the range is [−4, ∞).