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

    6
    ReputationRep:
    If you a back into 2a+b^2=15 you get b=3 or -3 but mark scheme says -3 which value do you take
    https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

    Question 5b
    Offline

    1
    ReputationRep:
    I haven't done the question, but have you noticed a>0?


    Posted from TSR Mobile
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by Adomas1990)
    I haven't done the question, but have you noticed a>0?


    Posted from TSR Mobile
    Yh i noticed that but b is not and can be -3 however the mark scheme says to put it into 2a+2b=0
    if you put it into the other equation is can be positive or negative 3
    Offline

    1
    ReputationRep:
    If you substitute b=-3 into equation, which value you find for a? You sure it's positive?


    Posted from TSR Mobile
 
 
 
  • 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
    Would you rather give up salt or pepper?
  • 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.