please help me with a 2u maths question! :) (1 Viewer)

[amour]

Consider the geometric series


find the values of x for which the limiting sum of this series exists.

Okay, so this is what I have so far, but what do I do after to simply and get x? Please explain <3

 

[HyperComplexxx]

exponential each side
1/e<x<e



OMG LZOOL

 

[amour]

exponential each side
-e<x<e

Do you mean multiply e on each side?

 

[HyperComplexxx]

Do you mean multiply e on each side?

then you should get
1/e < x < e

 

[amour]

then you should get
1/e < x < e

Thankyou, repped.
I never knew you could do this to an equation

 

[SXCBEAST]

when is the velocity of a particle at its greatest?

 

[HyperComplexxx]

when is the velocity of a particle at its greatest?

the centre of motion

 

[_deloso]

when acceleration = 0

 

[SXCBEAST]

when acceleration = 0

Question says "at approximately what time is the particle moving with the greatest velocity?"

Is that the same thing?

 

[amour]

Question says "at approximately what time is the particle moving with the greatest velocity?"

Is that the same thing?

Yes, make the acceleration equation = 0, solve for t.

 

[_deloso]

yeah cos you're finding the maximum velocity. which is dv/dt = 0 and dv/dt is acceleration. so in your question, solve for t when dv/dt = 0 and you have to prove that the value at t is a max by using first or second derivative test

 

[SXCBEAST]

oh thanks so much, i thought so but this book is weird :S whatevs, good luck to everyone doing their exam tomorrow

 

[amour]

oh thanks so much, i thought so but this book is weird :S whatevs, good luck to everyone doing their exam tomorrow

gooodluck <3

 

[_deloso]

good luck to everyone! and good luck to op, lol soz for stealing your thread