Determine the maximum value of the quadratic function .

Answer and explanation

Correct answer: C.

  1. Step 1: For a quadratic function with , the parabola opens downwards and has a maximum turning point. The axis of symmetry occurs at .
  2. Step 2: Substitute into : . Therefore, the maximum value is 5.
Answer
.
Why not the others: '' is an arithmetic calculation error; '' is the linear coefficient ; '' is the y-intercept , not the maximum vertex value.

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