Algebra-1

Question Analysis
This question tests the student's ability to find the range of a quadratic function given in standard form. The function opens upward, so the vertex represents the minimum point.

Key Concept Explanation
The range of a quadratic function depends on the vertex's y-coordinate (k) and the sign of the coefficient a. For a parabola that opens upward ( ), the range is all y-values greater than or equal to the vertex's y-coordinate.

Step-by-step Solution
1. Convert the function to vertex form by completing the square: .
2. Simplify to get the vertex form:

Click "Show Answer" to reveal the answer and analysis