For anyone who needs a quick bit of revising, see:
for an example of the cover-up method.
Now, I've remembered pretty much everything I need to do, and for all fractions with distinct linear factors, I can use this technique to solve a partial fractions problem.
However, I don't understand how it actually works ...
For example, one of the steps requires that for each factor, you set x to a value that cancels one of the factors out. But by doing this, it sets that factor to be equal to 0 ... which surely should result in the entire denominator being 0 .......
How can this be?
Please explain. Thanks :)