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Properties of logarithms on the TI nspire

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**Kyle Kelly**:

Is it possible to make the TI-nspire apply properties of logarithms in order to rewrite multiple logs as one (the sum) or rewriting one log as multiple logs (the difference)?

I would assume the CAS version would be able to do this but I can't for the life of me figure out how. Is the feature built in the calculator or would you have to program it?

**Xeda112358**:

I think the nspire can collapse multiple logs into one (normal behavior), but extracting you'd have to program it yourself. If it is just integer inputs, you can use one of the nspire's factor() commands to factor the number and then manually construct a sum of logs.

**Kyle Kelly**:

--- Quote from: Xeda112358 on April 10, 2019, 10:33:22 am ---I think the nspire can collapse multiple logs into one (normal behavior), but extracting you'd have to program it yourself. If it is just integer inputs, you can use one of the nspire's factor() commands to factor the number and then manually construct a sum of logs.

--- End quote ---

Okay to combine multiple logs into one how would i do it?

For example: 5 log base 3(y) - log base 3(x-4)

https://imgur.com/a/Cxvkuax picture for reference and the solution i'm trying to get

**Xeda112358**:

Oh, I just tested it out on my calc and it didn't simplify :|

What did work is when I did:

--- Code: ---log(3^(5*log(y,3)-log(x-4,3)),3)

--- End code ---

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