Guyz in Mathematics this a way in which we can find the exponent of a number by Log

[Kareem Gamal Omar]

How can we do that if anyone can please tell me i will be so grateful please

 

[Kareem Gamal Omar]

Anyone please???!

 

[Mohammad Ahmad]

type on your cAL.
(ln X )/(ln the number with X power )
hope i helped

 

[Kareem Gamal Omar]

Explain more xD sorry didnt get it
what exactly to i type in the cal?

 

[Mohammad Ahmad]

e.g. 2^x=512
find X ... what to do is that you type (ln 512)/(ln2)
you should get 9 as the answer

 

[Mohammad Ahmad]

this kind of answer is usually for 1 mark

 

[kareem]

How can we do that if anyone can please tell me i will be so grateful please

if its lets say 2^x = 512
you should do it like this "log 512 / log 2" then u can check
if its 2 marks you gotta change the bases and show them how you got it

 

[Kareem Gamal Omar]

Thankies!!

 

[smzimran]

if its lets say 2^x = 512
you should do it like this "log 512 / log 2" then u can check
if its 2 marks you gotta change the bases and show them how you got it

Thankies!!

this kind of answer is usually for 1 mark

AOA,
Here:

ln is natural log, it stands for log base 'e' and you should know that:
ln e = 1
ln 1 = 0
if equation such as this is given:
ln x = 5
then
x = e^5
Similarly if an equation such as this is given:
e^x = 5
then taking ln on both sides
x lne = ln5 (lne = 1)
x = ln5

lg is general log, it stands for log base '10' and you should know that:
lg 10 = 1
lg 1 = 0
if equation such as this is given:
lg x = 8
then
x = 10^8
Similarly if an equation such as this is given:
10^x = 8
then taking lg on both sides
x lg10 = lg8 (lg10 = 1)
x = lg 8

Another type of question can be this:
3^x = 5
Now, its your choice either you can take ln of both sides or lg of both sides
Im taking ln of both sides
ln(3^x) = ln5
x ln3 = ln5
x = ln5/ln3

 

[Kareem Gamal Omar]

AOA,
Here:

ln is natural log, it stands for log base 'e' and you should know that:
ln e = 1
ln 1 = 0
if equation such as this is given:
ln x = 5
then
x = e^5
Similarly if an equation such as this is given:
e^x = 5
then taking ln on both sides
x lne = ln5 (lne = 1)
x = ln5

lg is general log, it stands for log base '10' and you should know that:
lg 10 = 1
lg 1 = 0
if equation such as this is given:
lg x = 8
then
x = 10^8
Similarly if an equation such as this is given:
10^x = 8
then taking lg on both sides
x lg10 = lg8 (lg10 = 1)
x = lg 8

Another type of question can be this:
3^x = 5
Now, its your choice either you can take ln of both sides or lg of both sides
Im taking ln of both sides
ln(3^x) = ln5
x ln3 = ln5
x = ln5/ln3

That is what A2 or AS level CUZ i really DID NOT UNDERSTAND A SINGLE WORD!~!

 

[smzimran]

That is what A2 or AS level CUZ i really DID NOT UNDERSTAND A SINGLE WORD!~!

O level Add maths,
AS level P1
A2 level P3

These are basic logarithmic skills you need to know!

 

[Kareem Gamal Omar]

LOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOL!!!!!!! IAM JUST GOING WITH MY TEACHER'S WAY LOL Iam an IGCSE student not O'level WOWOWOWOWOW!!

 

[smzimran]

Ok go on!
But you will come across this,
and its very easy once you learn this once

 

[Kareem Gamal Omar]

ONCE i learn