# How do you simplify and find the excluded values for #9/(15a-15)#?

##### 1 Answer

Mar 28, 2018

#### Explanation:

Look for things you can cancel out.

Write as:

Divide top and bottom by 3

We 'are not allowed' to have a 0 as the denominator of a fraction. The official name for this condition is that it is 'undefined'.

So the excluded value is