How do you multiply #(3x +2) (3x - 2)#?
You must distribute the values.
There is a method for this called FOIL. The means First, Outer, Inner, Last.
First-Multiply the first terms in each binomial, meaning
Outer-Multiply the first term of the first binomial by the outermost term, meaning
Inner-Multiply the innermost terms, so
Last-The last terms of each binomial, multiplied, which is
Combine the remaining results, which are just
You can check an answer such as this one by substituting an x value and seeing if the expressions are equal.