How do you evaluate log_7 (-49)log7(49)?

2 Answers
Aug 30, 2016

log_7 (-49) "is undefined"log7(49)is undefined in RR.

Aug 30, 2016

undefined

Explanation:

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.