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 $f$ ?

MM

Mashaal Masha

Feb 21, 2024

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 $f$ ?

Difficulty: Hard

A:

$-4<x<-3$

B:

$-3<x<1$

C:

$1<x<3$

D:

$3<x<4$

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