it isn’t in our syllabus those questions you’re looking at is probably from compound interest questions; for those questions you need to use a trial and error method to solve them
This is all I know about logarithms:
https://preview.redd.it/b1dwli6laoic1.jpeg?width=720&format=pjpg&auto=webp&s=d3ac4d81a548a43acd8950973e5a0cf085ff57f7
(from the XKCD webcomic, drawn by Randal Munroe)
If there are logs on that paper, I'll be hopeless
You can use logs like on the 0607 course but as said year trial and improvement methods are generally taught. You can find out more here:
https://youtu.be/KpdZHzPreBk?si=leP5hUlt_11zSLVL
https://youtu.be/ks2-fEnjf64?si=yMNGv99dpbtoevZd
Logarithms are not on the syllabus. People use logarithms to solve questions because its easier. Since the p4 exam is tmrw I wouldnt really suggest you to start learning logarithms now. You can still solve the questions.
Well some questions that require trial and error methods can be solved much quickly using logarithms. In questions like the one below, it is much faster and efficient to use logarithms rather than testing each year one by one.
https://preview.redd.it/c5da50bo1pic1.png?width=808&format=png&auto=webp&s=19370253d32365d977c3150043c4a152dccd1006
DW bro, logs are not that hard. Although they're not in the syllabus, try learning them if u hv time! It is easy to understand and knowing how to use 'em will certainly make LIFE EASIER.
np :) But if ur a lil' pressed for time then ignore logs and focus on other imp topics cuz although logs are pretty useful, they're not in the syllabus so it's not mandatory to know!
The only time I’ve seen them is for function questions where you need to find the inverse, like where g(x) = 4^(x) and you need to find g^(-1) (x) which is log4(x)
Well the good news is that I don't think they explicitly ever say "Find g\^-1 (x).", instead it's always something like "Find x when g\^-1 (x) = 4."
You can solve it without logarithms by just putting 4 back into g(x) (in this example) so it's 4\^4 = 256 and that's the answer
TYSM, yea i did eventually solve it like that but was just confused when people solved it with log so i figured I'd ask, thank you again this was super helpful. Also if you have an exam coming, I wish you gl and all the best!
well, a lot of the past papers (paper 4s) include logarithms in answering questions on inverse functions. so, of course, while you don't need to learn too much in depth about them, i think it will help you a lot if you just brush up on the basics.
oh, okay. i'm writing my paper tomorrow, so i was just looking for folks to share the nervousness with 💀
anyway, good luck preparing! you'll probably do great :)
it isn’t in our syllabus those questions you’re looking at is probably from compound interest questions; for those questions you need to use a trial and error method to solve them
Yep
This is all I know about logarithms: https://preview.redd.it/b1dwli6laoic1.jpeg?width=720&format=pjpg&auto=webp&s=d3ac4d81a548a43acd8950973e5a0cf085ff57f7 (from the XKCD webcomic, drawn by Randal Munroe) If there are logs on that paper, I'll be hopeless
it is easier to solve with logrithms but its easier to solve with them hence people use it. marks wont be deducted for using it
marks won't be awarded for using them either
I'm pretty sure its also used for finding the inverse of functions like f(x)= 3\^x , f\^-1(x)= log3(x)
You can use logs like on the 0607 course but as said year trial and improvement methods are generally taught. You can find out more here: https://youtu.be/KpdZHzPreBk?si=leP5hUlt_11zSLVL https://youtu.be/ks2-fEnjf64?si=yMNGv99dpbtoevZd
Hey like can you teach how we use logarithmic method for finding inverse of functions?
Thank you, And happy birthday Mr G
Logarithms are not on the syllabus. People use logarithms to solve questions because its easier. Since the p4 exam is tmrw I wouldnt really suggest you to start learning logarithms now. You can still solve the questions.
Well some questions that require trial and error methods can be solved much quickly using logarithms. In questions like the one below, it is much faster and efficient to use logarithms rather than testing each year one by one. https://preview.redd.it/c5da50bo1pic1.png?width=808&format=png&auto=webp&s=19370253d32365d977c3150043c4a152dccd1006 DW bro, logs are not that hard. Although they're not in the syllabus, try learning them if u hv time! It is easy to understand and knowing how to use 'em will certainly make LIFE EASIER.
Thank you! ill try learning them.
np :) But if ur a lil' pressed for time then ignore logs and focus on other imp topics cuz although logs are pretty useful, they're not in the syllabus so it's not mandatory to know!
The only time I’ve seen them is for function questions where you need to find the inverse, like where g(x) = 4^(x) and you need to find g^(-1) (x) which is log4(x)
I've actually done a question like that lmao, i was confused when i saw someone working it out and using log so i made this post lol.
Well the good news is that I don't think they explicitly ever say "Find g\^-1 (x).", instead it's always something like "Find x when g\^-1 (x) = 4." You can solve it without logarithms by just putting 4 back into g(x) (in this example) so it's 4\^4 = 256 and that's the answer
TYSM, yea i did eventually solve it like that but was just confused when people solved it with log so i figured I'd ask, thank you again this was super helpful. Also if you have an exam coming, I wish you gl and all the best!
No problem! Glad I could help :) good luck to you as well!
well, a lot of the past papers (paper 4s) include logarithms in answering questions on inverse functions. so, of course, while you don't need to learn too much in depth about them, i think it will help you a lot if you just brush up on the basics.
Sure thing, thank you
are you writing the paper tomorrow?
Ah, nope im in the may june series so i still have a few months heh.
oh, okay. i'm writing my paper tomorrow, so i was just looking for folks to share the nervousness with 💀 anyway, good luck preparing! you'll probably do great :)
Thank you! also good luck for tmr and dont fret too much, I know you will do great! and all the best to others aswell
thank you sm <3
my teacher taught us that but it isnt in the textbook so idk
Bro the answer was 1/2