# How do you multiply #(a-9)^2#?

##### 1 Answer

Feb 19, 2017

There are two ways to expand this. The first way is to use this rule:

Substituting

The second way is to first rewrite this expression as:

Then, to multiply these two terms you multiply each individual term in the left parenthesis by each individual term in the right parenthesis.

We can now combine like terms: