How do you subtract #9/(x^2-9) - 5/ (x+3)#?
I have shown every step in 'over the top' detail so you can see where everything comes from.
When presented with questions you look for links which means you have to build up a 'toolbox' of remembered facts and techniques:
Substitute (3) into (2) giving:
Substitute (4) into (1) giving:
Now both denominators have something in common so we can combine them
substituting (6) into (5) and rewriting the expression gives:
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