Not sure if this is what you are asking but it sounds to me like you are asking what is the product of
(3z + 2x)(3z + 2x)
When doing these type of problems use the phrase foil (first, outer, inner, last)
9z^2 + 6xz + 6xz + 4x^2
= 9z^2 + 12xz + 4x^2
Thanks. That what I thought it was.
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