What is the answer for question 15) ? http://postimg.org/image/6g52noj6f/
violy | Certified Educator
The Product Rule for Logarithms
For any positive numbers M, N and `a (a=1)` ,
`log_aMN = log_aM + log_aN`
It is not possible to use the product rule for logarithms on log(-7) + log(-4), since -7 anf -4 are not positive numbers.