# Find the axis of summetry and the Vertex of its graph. Y=x2/squared-8x

Find the axis of summetry and the Vertex of its graph. Y=x2/squared-8x

## This Post Has 3 Comments

1. brose0707 says:

Direction: Opens Up

Vertex:

(

4

,

18

)

(4,-18)

Focus:

(

4

,

71

4

)

(4,-714)

Axis of Symmetry:

x

=

4

x=4

Directrix:

y

=

73

4

y=-734

Select a few

x

x values, and plug them into the equation to find the corresponding

y

y values. The

x

x values should be selected around the vertex.x

y

2

14

3

17

4

18

5

17

6

14

xy2-143-174-185-176-14

Graph the parabola using its properties and the selected points.

Direction: Opens Up

Vertex:

(

4

,

18

)

(4,-18)

Focus:

(

4

,

71

4

)

(4,-714)

Axis of Symmetry:

x

=

4

x=4

Directrix:

y

=

73

4

y=-734

x

y

2

14

3

17

4

18

5

17

6

14

xy2-143-174-185-176-14

image of graph

2. Expert says:

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

3. Expert says:

The percent increase is 25%