The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

All the intervals that contain the number are solution of the problem

Step-by-step explanation:

we know that

The equation of a vertical parabola into vertex form is equal to

where

(h,k) is the vertex of the parabola

In this problem we have

Convert to vertex form

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Complete the square. Remember to balance the equation by adding the same constants to each side.

Rewrite as perfect squares

-------> equation in vertex form

The vertex is the point

The x-coordinate of the vertex is

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation:

b.

step-by-step explanation:

i just know