What is the length of DB?

http://i.imgur.com/YiqeFYL.png

6.5 cm

4 cm

–5.5 cm

5 cm

I am really struggling with this - the closest I've gotten is 60 = (x-1)(x-12). I am learning about the side-splitting theorem. How can I solve this problem?

Thank you :)

Question

What is the length of DB?

http://i.imgur.com/YiqeFYL.png

       6.5 cm

       4 cm

       –5.5 cm

       5 cm

I am really struggling with this - the closest I've gotten is 60 = (x-1)(x-12). I am learning about the side-splitting theorem. How can I solve this problem?

Thank you :)

anonymous · Answer

Still would really appreciate the help for this :)