Code: Select all

```
C
/|\
/ | \ 10
17 / | \
/ | \
/ | \
------------------------
A x D y B
```

*In triangle ABC, if AC = 17 cm, CB = 10 cm, AD = x cm, DB = y cm, and AB = 21 cm, find the value of x - y.*

I have no idea how to get started on this one. It's the last one in the assignment, but it doesn't have a "*" by it, so it shouldn't be this hard!