Question

15.

Which of the quadratic functions has the widest graph?

A. 0.3x2

B. -4x2

C. -4/5x2

D. 1/3x2

Answer 1

If I’m correct, I think A. 0.3x2 is the correct answer.

Answer 2

A. 0.3x2

Explanation:

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

Direction: Opens Up

Vertex:

(

0

,

0

)

Focus:

(

0

,

0.8

¯

3

)

Axis of Symmetry:

x

=

0

Directrix:

y

=

−

0.8

¯

3

x

y

−

2

1.2

−

1

0.3

0

0

1

0.3

2

1.2

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

Direction: Opens Down

Vertex:

(

0

,

0

)

Focus:

(

0

,

−

1

16

)

Axis of Symmetry:

x

=

0

Directrix:

y

=

1

16

x

y

−

2

−

16

−

1

−

4

0

0

1

−

4

2

−

16

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

Direction: Opens Down

Vertex:

(

0

,

0

)

Focus:

(

0

,

−

5

16

)

Axis of Symmetry:

x

=

0

Directrix:

y

=

5

16

x

y

−

2

−

16

5

−

1

−

4

5

0

0

1

−

4

5

2

−

16

5

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

Direction: Opens Up

Vertex:

(

0

,

0

)

Focus:

(

0

,

3

4

)

Axis of Symmetry:

x

=

0

Directrix:

y

=

−

3

4

x

y

−

2

4

3

−

1

1

3

0

0

1

1

3

3

3