The function f is defined by f(x) = (x+3)(x+1). The graph of f in the xy-plane is a parabola....

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Official SAT Practice Test 7 Section 3 Question 12:

The function f is defined by f(x) = (x+3)(x+1). The graph of f in the xy-plane is a parabola. Which of the following intervals contains the x-coordinate of the vertex of the graph of f ?
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