How you get the fourth line down and answer
Answer provided by our tutors
You can obtain an explanation for any step by clicking on it. Please note that you cannot click on the very first expression, which is the original problem.
If you are not satisfied with the number of solution steps displayed (either too many steps or too few), click on the Options button to adjust the number of steps to be shown. If you apply 'Show: a lot of steps' you will get the following more step by step solution: