Join TSR now and get answers to all your questions about uniSign up now

Core 4 binomial

    • Thread Starter
    Offline

    2
    ReputationRep:
    If I sub in x=-1 I get ½[(15)^0.25] so I can double the answer to work out
    and approximation to (15)^0.25

    My question is why can I not use a similar approach for x = -15.976
    The answer should be 10 times too small but it doesn't work??
    Attached Images
     
    Online

    3
    ReputationRep:
    (Original post by mrmanps)
    If I sub in x=-1 I get ½[(15)^0.25] so I can double the answer to work out
    and approximation to (15)^0.25

    My question is why can I not use a similar approach for x = -15.976
    The answer should be 10 times too small but it doesn't work??
    Please post your image the correct way round. I know it looks the correct way on your computer or phone but something annoying happens and it uploads in the orientation that you took it relative to something.

    But I would say remember the range of x values for which the expansion is valid and how you find it. Anything of magnitude 15 probably isn't in that range
 
 
 
Poll
Which party will you be voting for in the General Election 2017?

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

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