# Alevels maths C2 help doubt question in text book logarithm and exponential

Watch
Announcements
#1
In C2 MATHEMATICS IN LOGARITHMS AND EXPONENTIALS,

a) in 3F exercise,
the question is

Solve giving answer to 3 significant figures
log x + log x = 2
2 4

How to solve this? Can u show the steps?

Another question is in 3G
given that p= log 16, express in terms of p.
q

i) log 2 (ii) log (8q)
q q

Pls help. Sir and please add me on your friends contacts. I am private student. Therefore i need to ask doubts ,where i found ur profile helpful to clear my doubts. All these questions are from logarithms and exponentials.

thank u
0
7 years ago
#2
(Original post by kers123)
In C2 MATHEMATICS IN LOGARITHMS AND EXPONENTIALS,

a) in 3F exercise,
the question is

Solve giving answer to 3 significant figures
log x + log x = 2
2 4

How to solve this? Can u show the steps?

Another question is in 3G
given that p= log 16, express in terms of p.
q

i) log 2 (ii) log (8q)
q q

Pls help. Sir and please add me on your friends contacts. I am private student. Therefore i need to ask doubts ,where i found ur profile helpful to clear my doubts. All these questions are from logarithms and exponentials.

thank u
You may find LaTex useful

I assume that your question is

Do you know how to change base so that both elements of the LHS have the same base
0
#3
i did like this.

(log x + log x )
10 10
------ -------- = 2
log 2 log 4
10 10

2= 2log x
10
--------------------
log 2 + log 4
10 10

log x = 0.9
10

0.9
10 =x

therefore x= 8

but the answer behind the book is 2.52
0
7 years ago
#4

1.) Use the change of base rule to change into something to base 2

2.) then use

3.) then solve
0
#5
cool but how to change base 4 to 2. have any idea?
0
7 years ago
#6
(Original post by kers123)
cool but how to change base 4 to 2. have any idea?
gives so that
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### How would you describe the quality of the digital skills you're taught at school?

Excellent (37)
9.84%
Okay (109)
28.99%
A bit lacking (140)
37.23%
Not good at all (90)
23.94%