because multiplication of powers results in adding exponents, one can reduce this to
3^n*3^1 - 3^n*3^-2
3^n * (3-1/9)=3^n (2 8/9)
3^(n+1)-3^(n-2)
Need help simplifying this please.
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still don't really quite understand. could you explain your process a bit more?
Mara -- why are you butting in to richard's question?
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