SAT Math Practice Question
The function $f$ is defined by $f(x)=(x+3)(x+1)$. The graph of $f$ in the $x y$-plane is a parabola. Which of the following intervals contains the $x$-coordinate of the vertex of the graph of $f$ ?
- A.$-4<x<-3$
- B.$-3<x<1$
- C.$1<x<3$
- D.$3<x<4$
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