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1. May 6, 2016

colt

1. The problem statement, all variables and given/known data

solve the log x²-4x-5 on the base x-2.

2. Relevant equations

I read a comment from someone that also saw the question that says:
3. The attempt at a solution

If it was x²-4x+4, that would be igual (x-2)² and the answer would be 2, but I have no idea the guy got these broken numbers. Making what equal to zero?
the x²-4x-5? Doesn't make sense.

2. May 6, 2016

SammyS

Staff Emeritus
First of all: There is no equation to be solved in your thread.

Second: x2 − 4x − 5 can be factored quite nicely.

Third: What do you mean by " base x-2 " ?

Fourth: x = 5.1623 , −1.1623 are approximate solutions to x2 − 4x − 6 = 0 .

Last edited: May 6, 2016
3. May 6, 2016

haruspex

Where does the question come from?

4. May 8, 2016

colt

It's the base of the log, $(x-2) ^ {y} = x² -4x -5$. The statement is to solve it.

From a video where the presenter receives random questions about several subjects. Someone asked it, a comment about it mentioned the roots and I got curious about whether this has a solution or not.

5. May 8, 2016

haruspex

Ok, so we should not be too surprised that the question makes no sense.