Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hey guys
    In C2 for logarithms how do you manipulate a question with three minus logs??
    Coz I know that when there's a minus you divide the logs but how do you do that if there are three minuses??

    Ex: log(2)11x+3 - log(2)5x - 2log(2)x = 1
    Please help 😭😭😭
    Offline

    2
    ReputationRep:
    divide again
    Offline

    22
    ReputationRep:
    Wow. Exam in 9 hours
    Offline

    12
    ReputationRep:
    think of it like this:

    log(2)11x+3 - [log(2)5x + 2log(2)x] = 1
    Offline

    1
    ReputationRep:
    You can consider it as (using my own values)
    log(a)-log(b)-log(c)=d
    log(a)-(log(b)+log(c))=d
    log(a)-log(bc)=d
    log(a/bc)=d
    Offline

    12
    ReputationRep:
    basically u can just combine two of them together into one, and then combine that one with the 3rd one. U could try it in different combinations and see how it works to help u get ur head round it
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by CuriosityKTMC)
    You can consider it as (using my own values)
    log(a)-log(b)-log(c)=d
    log(a)-(log(b)+log(c))=d
    log(a)-log(bc)=d
    log(a/bc)=d
    Thank you so much!!! 👌🏻💯
    But how comes you multiply b and c despite there being a minus between then??
    Offline

    18
    ReputationRep:
    You can also take one to the other side and have log (a/b) =log (cd)
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by glad-he-ate-her)
    You can also take one to the other side and have log (a/b) =log (cd)
    Then would you cancel out the logs coz they're the same??
    Offline

    1
    ReputationRep:
    (Original post by CrystalPark)
    Thank you so much!!! 👌🏻💯
    But how comes you multiply b and c despite there being a minus between then??
    I put them in a bracket so in the bracket they are add and then you subtract the whole thing.
 
 
 
Poll
Who is your favourite TV detective?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

Sponsored content:

HEAR

HEAR

Find out how a Higher Education Achievement Report can help you prove your achievements.

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.