Algebra-1

Question Analysis
This question tests the student's ability to determine the range of a quadratic function in standard form by finding the vertex and the direction it opens.

Key Concept Explanation
The range of a quadratic function depends on the vertex’s -coordinate and the sign of the coefficient . If , the parabola opens upward, and the range is all -values greater than or equal to the vertex’s -coordinate.

Step-by-step Solution
1. Identify the given quadratic function: .
2. Find the -coordinate of the vertex using :