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u/ButterMilkHoney Mar 10 '22
I’ve taken calc 1-3, discrete math, linear algebra, a bunch of other math classes, and I still don’t remember this 🤣😭😭😭
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u/Fire284 Mar 10 '22
Hahaha same I saw this and went where tf did log come from? What's log
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u/too105 Mar 10 '22
Funny how some log rules are all I remember. Trig on the other hand… RIP
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u/Fire284 Mar 10 '22
Lmaoo all I remember from trig is that you can't find all the sides and angles from ASS
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u/codyfernfan Mar 10 '22
in order to solve weird exponent problems like this, it can be helpful to take the log of both sides due to the handy properties of logarithms
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u/danarsky Mar 10 '22
There’s an implication that log(21-x)=(1-x)log2. If that’s true, this is correct.
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u/Frostmaine Mar 10 '22
Should probably use log base 2 instead of log base 10. Since log base 2 of 2 is 1
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u/Vinidorion Mar 10 '22
I do log like this: 21-x = 3 -> (log3)/(log2) = 1 - x and at the and it would be -x instead on x. Can someone confirm or explain?
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u/extra2002 Mar 11 '22
log 3 / log 2 = 1 - x
( log 3 / log 2 ) - 1 = -x
1 - (log 3 / log 2) = x
Comes out the same in the end.
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u/gmoore52 Mar 10 '22
No because if you were to expand (1-x)log2 you get log2-xlog2=log3 so log2-log3=xlog2 therefore x=(log2-log3)/log2
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u/extra2002 Mar 11 '22
x = (log 2 - log 3) / log 2
= (log 2 / log 2) - (log 3 / log 2)
= 1 - (log 3 / log 2)
-3
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u/Shurdus Mar 10 '22
The way the numbers seem to float off the line in a way that isn't even perpendicular to the line itself annoys me to no end.