Anna, hello. The distributive property tells us that multiplication distributes over addition. In symbols, for any expressions A, B and C, we have that A(B+C)=AB+AC. In your case A is 9, B is 2 and C is -3b. So we have that 9(2-3b)=9(2)+9(-3b). This simplifies to 18-27b. Lastly, we add two to get 2+18-27b=20-27b. I hope this helps.