0:00
Okay, the first one here.
00:02
Find the exact value of x.
00:04
You can use logs.
00:06
Log base 10.
00:07
So l -o -g means log -base 10.
00:10
The number always means 10.
00:13
So this becomes, like, the third law of logs, negative x times log 10 equals log -169.
00:25
Well, that is based 10.
00:31
So log base 10 of 10 is simply 1.
00:33
What power of 10 is 10 is 10.
00:35
1.
00:36
So negative x then is log of 169, which means x then will be minus log of 169.
00:48
That's okay for the answer.
00:51
Well, that should be okay, negative log 169 or write it as log of 169, the power of negative 1 .6, also okay, as is log...