How do you evaluate $log_7 (-49)$ ?

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Answer 1 · 2016-08-30T16:53:09

$log_7 (-49) "is undefined"$ in $RR$ .

Answer 2 · 2016-08-30T17:49:27

undefined

$y=log_7(-49)$ . Then $y$ is the number such that $7^y=-49$ .

There is no real number $y$ that makes $7^y=-49$ true, so it is undefined.

$logx$ is undefined for $x<=0$ .

How do you evaluate log_7 (-49)log_7 (-49)?