Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta

C3 maths question watch

Announcements
    • Thread Starter
    Offline

    3
    ReputationRep:
    can anyone solve this:
    2x^2 = sqrt*x / 2
    and get the answer of 1/2.
    thank you!
    Offline

    14
    ReputationRep:
    is that the sqrt(x/2) or (sqrt(x))/2?
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Asurat)
    is that the sqrt(x/2) or (sqrt(x))/2?
    second one !
    Offline

    19
    ReputationRep:
    (Original post by Remainresilient_)
    second one !
    Post your working please.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Muttley79)
    Post your working please.
    to try and solve it at first i got:
    4x^2 = x^1/2
    then i got - x^1/2 / x^2, which gave me x^-3/2 = 4
    But then i keep getting the wrong answer for this
    Offline

    14
    ReputationRep:
    (Original post by Remainresilient_)
    to try and solve it at first i got:
    4x^2 = x^1/2
    Did you keep the operations consistent for both LHS and RHS?
    Offline

    18
    ReputationRep:
    From the way you've written out the question atleast, the answer is not 1/2
    Offline

    19
    ReputationRep:
    (Original post by Remainresilient_)
    x^-3/2 = 4
    It might have been more sensible to keep powers positive for x - can you see how to rewrite this?
    • Thread Starter
    Offline

    3
    ReputationRep:
    Name:  image.jpg
Views: 55
Size:  155.6 KBAlright so this is the whole question, not being able to type it was annoying! But just to make the question a bit clearer, I attached it!
    Offline

    18
    ReputationRep:
    (Original post by Remainresilient_)
    Name:  image.jpg
Views: 55
Size:  155.6 KBAlright so this is the whole question, not being able to type it was annoying! But just to make the question a bit clearer, I attached it!
    2x^2 = sqrt(x / 2)
    4x^4 = x/2 (square both sides)
    8x^4 = x (take 2 to the other side)
    8x^3 = 1 (cancel the x)
    x^3 = 1/8 (take the 8 to the other side)
    x = 1/2
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Student403)
    2x^2 = sqrt(x / 2)
    4x^4 = x/2 (square both sides)
    8x^4 = x (take 2 to the other sidue)
    8x^3 = 1 (cancel the x)
    x^3 = 1/8 (take the 8 to the other side)
    x = 1/2
    . Fabulous! Thank you x
 
 
 
Poll
Do you like carrot cake?
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

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.