The value of given exponential expression [tex]3^{4}. 3^{x}[/tex] is [tex]3^{4+x}[/tex] and [tex]81(3^{x})[/tex].
"Exponential expressions are just a way to write powers in short form. The exponent indicates the number of times the base is used as a factor."
Given exponential expression is
[tex]3^{4}. 3^{x} \\= 81(3^{x})[/tex]
Therefore, the value of [tex]3^{4}. 3^{x}[/tex] is [tex]3^{4+x}[/tex] and [tex]81(3^{x})[/tex].
Learn more about an exponential expression here: https://brainly.com/question/2589007
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