Multiplying double brackets - differentiated, solutions included

I created this for a low/middle ability KS4 group.

The grid of expressions is intended to be printed, laminated and cut up and a set given to each pair of pupils.
Pupils can select what level of difficulty of question they feel confident to attempt using any combination of green/yellow/red cards.
To encourage them to challenge themselves if they can there is a solutions grid which has a scoring system which increases alongside the difficulty. Pairs can 'compete' with each other to get the best score.
I have printed the answers and the scoring grid back to back and laminated this also; so whilst they are working the score grid is uppermost on the desk and then can be flipped over at an appropriate time for checking answers.

PLEASE NOTE I SPOTTED A TYPO ON ONE OF THE BOXES OF THE SOLUTIONS AND HAVE AMENDED IT NOW. (If anybody else does happen to see any other errors please do let me know and I will correct them too).

I hope you find this helpful.