How to Use Vieta's Formula for Finding Roots of a Polynomial?

[sooyong94]

Homework Statement

Part (b)

Homework Equations

Vieta's formula

The Attempt at a Solution

Part (a):

I'm kinda stuck on part (b) - I tried multiplying the product of roots and got b^2 d^2, but I have no idea on dealing with the sum of roots.

 

[ehild]

Homework Statement

Part (b)

Homework Equations

Vieta's formula

The Attempt at a Solution

Part (a):

I'm kinda stuck on part (b) - I tried multiplying the product of roots and got b^2 d^2, but I have no idea on dealing with the sum of roots.

It would be easier using the quadratic formula instead of Vieta's ones for proving b).

 

[sooyong94]

Thanks for the hint - I managed to work this problem out.