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

    9
    ReputationRep:
    (Original post by tnetennba)
    You could use logarithms:
    Log 4^x = Log 0.25
    x Log 4 = Log 0.25
    x= (Log 0.25)/(Log 4)
    x=-1
    I want to make it clear to you that i didn't gave you neg rep, i don't know who gave it.

    I think that you thought that i gave you a neg rep so you neg repped me, right?
    Offline

    2
    ReputationRep:
    Make them both to the base of 2 and then equate the indices...

    4 ^ x = 2^2x
    1/4 = 2^-2

    2^2x = 2^-2

    equate both indices...
    2x = -2
    x = -1

    In conclusion: Equate both bases and then equate the indices and simplify.
    Offline

    2
    ReputationRep:
    (Original post by Waqar.)
    Make them both to the base of 2 and then equate the indices...

    4 ^ x = 2^2x
    1/4 = 2^-2

    2^2x = 2^-2

    equate both indices...
    2x = -2
    x = -1

    In conclusion: Equate both bases and then equate the indices and simplify.
    The bases are fine as it is, I don't see why you are changing it to 2. It's quite easy to see it using the base 4.
    Offline

    2
    ReputationRep:
    (Original post by raheem94)
    ln is in C3, while OP is studying C1 so she probably doesn't knows logarithms.
    Fair enough, if I'm honest I'm not 100% clear on what's covered in each module having done a different specification.
    Offline

    2
    ReputationRep:
    (Original post by jessica_anne_clu)
    but how would you go about it? I know the answer is -1 but I don't know how you'd get it
    You can show it using the ln rule however you apparently haven't been taught it yet so the other method would be comparing powers (make sure the base on both sides are equal).
 
 
 
  • See more of what you like on The Student Room

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

  • Poll
    Has a teacher ever helped you cheat?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

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

  • 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.