Here's the question you clicked on:
GOODMAN
I forgot logarithms :/ log_5(8r-7)=log_5(r^2+5)
if:\[\log_bA=\log_bB\implies A=B\]
So all I need to do is set them equal to eachother? Sorry, I kinda forgot all this, and studying again.
yes, so assuming your question is:\[\log_5(8r-7)=\log_5(r^2+5)\]then you would have:\[8r-7=r^2+5\]solve this for r.
Okay, but if i were to have something like: log_9(x+4)+log_9(x-4)=1
then you would use the rule:\[\log_bA+\log_bB=\log_b(A*B)\]
Ohhhh, okay, these rules are making its simple, are there any other important so I can study them? If you dont mind posting..
Perfect, thanks soo much!!