Explanation: Here once we have two terms that are common terms (they are common terms because both has the variable "x" in common) we can use the general rule below
[tex]ax^d\cdot bx^e=(a\cdot b)x^{d+e}[/tex]
Step 1:Let's substitute our values on the rule above and calculate as follows
[tex]7x^{-3}\cdot8x^9=(7\cdot8)x^{-3+9}=56x^6[/tex]
Final answer: So the final answer is
[tex]56x^6[/tex]
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