One of the questions in the homework I had trouble with was this one. I was making the mistake of subtracting 2 from 8, then distributing the product into the bracket and finally adding like terms. When I did this, the incorrect answer I was getting was this,

The correct way of doing this question is distributing the nearest term to the bracket, then adding like terms, rather than taking the nearest term to the bracket and multiplying, dividing, adding, or subtracting it by whatever is beside it, then distributing and adding like terms. When I did the question properly, the answer was,

In this unit it is important to recognize that even the smallest mistake can drastically effect your final answer, making attention to detail very important if you want to get a high mark.