Select all equations whose graphs have a vertex with x-coordinate 2

A. y=(x-2)(x-4)
B. y=(x-2)(x+2)
C. y=(x-1)(x-3)
D. y=x(x+4)
E. y=x(x-4)

Respuesta :

Answer:

C

Step-by-step explanation:

because you have to foil then do -b/2a

By finding the x-coordinate of each vertex, we will see that the correct options are C and E.

How to identify the x-value of the vertex?

For a quadratic equation of the form:

y = (x - a)*(x - b)

Where a and b are the roots, such that a < b, the x-value of the vertex is given by:

a + (b - a)/2

With that, we can check the x-value of the vertex of each option.

A) y=(x-2)(x-4)

The x-value of the vertex is:

2 + (4 - 2)/2 = 3

B)  y=(x-2)(x+2)

The x-value of the vertex is:

-2+ (2 - (-2))/2 = 0

C)  y=(x-1)(x-3)

The x-value of the vertex is:

1 + (3 - 1)/2 = 2

D) y = x(x+4) = (x - 0)*(x + 4)

The x-value of the vertex is:

-4 + (0 - (-4))/2 = -2

E)  y=x(x-4) = (x - 0)*(x - 4)

The x-value of the vertex is:

4 + (0 - (4))/2 = 2

So the two options that have a vertex with x-coordinate 2 are options C and E.

If you want to learn more about quadratic equations, you can read:

https://brainly.com/question/1214333