
Ravi S. answered 12/18/12
Tutoring for Biology, Math, English, and computers in general.
I'll give you more examples:
1. a(b-c) = a*b - c*b = ab - cb (You could also say ab - bc)
2. 9(3-c) = 9*3 - 9*c = 27 - 9c
3. 4a(b-d) = 4a*b - 4a*d = 4ab - 4ad
Just like the examples above,
4(v-9) = 4*v - 4*9 = 4v-36