- #1
lexpar
- 11
- 0
I'm new here. You already knew that. Thank you, you, for clicking on my thread in any case. So, I've got these two log problems. My math teacher gave them out as a challenge. The class is relatively new to logs, and I'm having trouble working with these longer questions (longer than "simplify log5+log3"). I think my main issue is with the sub scripts. I don't really know what to do with them. For the first question, where it a normal algebra question, I'd have it no problem. Those logs get in the way though. We've been given the answers, but need to prove them. Any help would be appreciated.
PS: the problems aren't for marks, they're more of a challenge thing before we do our test.
1: log25+log2(x-3)=4
log25+log2(x-3)=4
log25(x-3)=4
log2(5x-15)=4
?
?
x= 31/5
log3(x+4)=log77-log3(x+2)
log3(x+4)=log77-log3(x+2)
?
?
?
x= -9
x=-5
PS: the problems aren't for marks, they're more of a challenge thing before we do our test.
Homework Statement
1: log25+log2(x-3)=4
The Attempt at a Solution
log25+log2(x-3)=4
log25(x-3)=4
log2(5x-15)=4
?
?
x= 31/5
Homework Statement
log3(x+4)=log77-log3(x+2)
The Attempt at a Solution
log3(x+4)=log77-log3(x+2)
?
?
?
x= -9
x=-5