14. Which of the quadratic functions has the narrowest graph?

A. 9x2

B. 2/5x2

C. -10x2

D. -0.9x2

A. 9x2

Step-by-step explanation:

Graph the parabola using the direction, vertex, focus, and axis of symmetry.

Direction: Opens Up

Vertex:  

(

0

,

0

)

Focus:  

(

0

,

1

36

)

Axis of Symmetry:  

x

=

0

Directrix:  

y

=

−

1

36

x

y

−

1

9

0

0

1

9

Graph the parabola using the direction, vertex, focus, and axis of symmetry.

Direction: Opens Up

Vertex:  

(

0

,

0

)

Focus:  

(

0

,

5

8

)

Axis of Symmetry:  

x

=

0

Directrix:  

y

=

−

5

8

x

y

−

2

8

5

−

1

2

5

0

0

1

2

5

2

8

5

Graph the parabola using the direction, vertex, focus, and axis of symmetry.

Direction: Opens Down

Vertex:  

(

0

,

0

)

Focus:  

(

0

,

−

1

40

)

Axis of Symmetry:  

x

=

0

Directrix:  

y

=

1

40

x

y

−

1

−

10

0

0

1

−

10

Graph the parabola using the direction, vertex, focus, and axis of symmetry.

Direction: Opens Down

Vertex:  

(

0

,

0

)

Focus:  

(

0

,

−

0.2

¯

7

)

Axis of Symmetry:  

x

=

0

Directrix:  

y

=

0.2

¯

7

x

y

−

2

−

3.6

−

1

−

0.9

0

0

1

−

0.9

2

−

3.6