Axis of Symmetry of y=a(x-r_1)(x+r_2)

[mustang]

Problem 1.
Consider the equation y=a(x-r_1)(x+r_2)
Write the equation of the axis of symmetry.

 

[Chen]

That is just a simple parabola:
y = ax^2 - ax(r_1 - r_2) - ar_1r_2
Where is the 'vertex' of this parabola? What is its X coordinate?

 

[mustang]

How do you get the axis of symmetry..vertex..etc...

How would you get the axis of symmetry: x=-b/2a from b=-ax(r_1-r_2) and a= 1 or just a?

 

[mustang]

How do you get the axis of symmetry..vertex..etc...

How would you get the axis of symmetry: x=-b/2a from b=-ax(r_1-r_2) and a= 1 or just a?

 

[mustang]

How do you get the axis of symmetry..vertex..etc...

How would you get the axis of symmetry: x=-b/2a from b=-ax(r_1-r_2) and a= 1 or just a?

 

[mustang]

How do you get the axis of symmetry..vertex..etc...

How would you get the axis of symmetry: x=-b/2a from b=-ax(r_1-r_2) and a= 1 or just a?