Hey, you know... We'd better start checking our answers to make sure they're OK!
x = 3:
x = -2:
So, in this case, our answers are both good.
One thing you always need to watch out for is an answer that breaks a log's biggest rule:
|You can't take the log of a negative number!|
Look again at the log's graph:
|Logarithms only exist|
in positive x values!
So, Log 0 doesn't exist!
Log (-5) doesn't exist!
Teachers love sneaking these guys in for answers... So, keep an eye out!
Watch out for x's that give Log 0, too!