# How do you subtract #9/(x^2-9) - 5/ (x+3)#?

##### 1 Answer

I have shown every step in 'over the top' detail so you can see where everything comes from.

#### Explanation:

When presented with questions you look for links which means you have to build up a 'toolbox' of remembered facts and techniques:

Given:

Consider

But

Substitute (3) into (2) giving:

But

Substitute (4) into (1) giving:

Now both denominators have something in common so we can combine them

but

substituting (6) into (5) and rewriting the expression gives:

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