Join TSR now and get all your revision questions answeredSign up now

Help with binomial and rate of change please asap! Watch

    • Thread Starter
    Offline

    0
    ReputationRep:
    Hey,

    I really need help with two topics.

    Binomial expansion when x is a fraction e.g. (1+x/4)^8 find in ascending powers of x the first 5 terms and simplify. I can expand it, but I struggle to simplify. Also when it says the first 5 terms, considering the first bit of 1^8 is a term, does that mean i stop when I reach x^7? If someone could do this question please.

    Rate of change with a hemisphere, a bowl is being filled up at a constant rate of ** find *** , haven't got any examples of questions, but I guess it will ask show that the volume, V is = ***** or area, A is = ****** , then it may say show that DR/DT is = **** when r = ** , I just made this up but I assume it will be something similar to this.
    • Thread Starter
    Offline

    0
    ReputationRep:
    I think it may look something like this. My teacher just said there is a rate of change question with a bowl/hemisphere

    a) water is being poured into a bowl at a constant rate of 2cm^3 per second, at a time t, the radius is r, and the volume is V, show that V = **** and find dv/dr.

    b)use the results from part a) to show that dr/dt=*** when r=2
 
 
 
Poll
How are you feeling about your A-level results?

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.