To gain access to this level, you need to prove that you can expand.

1 minute of silence for the soldiers who didn't check this page before doing all the problems in expand.

Alright, you just need to solve this question to get to factorise.

3(x^2 + 4x + 7) + 4(x^3 + x)

Simply enter the co-effecients and you will get to the next part. For instance, 3x^3 + 2 is 3002. It won't be 03002.