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Question the-fu

2.1 Nonlinear Functions - Quadratic graphs and vertex form
0:00

The function f is defined by f of x equals, open parenthesis, x plus 3, close parenthesis, times, open parenthesis, x plus 1, close parenthesis. 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 ?

A.

negative 4 is less than x, which is less than negative 3

B.

negative 3 is less than x, which is less than 1

C.

1 is less than x, which is less than 3

D.

3 is less than x, which is less than 4