What is f(x) = x2 – 8x + 11 written in vertex form?
Sample Response: A quadratic function in standard form is converted to vertex form by completing the square. The first two terms are used to create a perfect square trinomial after a zero pair is added. The zero pair is found by taking half of the x-term coefficient and squaring it. The original constant term and the negative value of the zero pair are then combined.
x2 + 8x + [___]
16
671314
21324354
x + 3x + 9x + 12x + 36
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