To solve logarithmic equations first manipulate the equation to have one log with the same base on each side so you can drop the logs (the only way two logs can be equal is if their arguments are equal). Then solve the linear or polynomial equation (we know how to do that). The tricky part is that you have to check the solutions by plugging them into the original logarithmic equation (you can’t take logs of negative numbers).

Some useful logarithm properties to get familiar with before we start:

- n=log
_{a}(a^{n}) - log
_{a}(x)+ log_{a}(y)= log_{a}(xy) - nlog
_{a}(x)= log_{a}(x^{n}) - log
_{a}(x)-log_{a}(y)= log_{a}(x/y)

Here’s a more advanced example (click here):

Here’s an example with natural logarithms (click here):

Cheers,

Michal

Thank you.

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