where did I go wrong? (1 Viewer)

[mreditor16]

Hey Guys,

So I was doing this q:



and I got to part iv) and did it like this



but the answers say this:



where did I go wrong?

rep on offer for useful answers!

thanks guys!

 

[Fade1233]

Cssa 2014. Ask me if you need sols.

 

[Carrotsticks]

You used the formula from part (iii) to go from your infinite sum to a closed form.

However, the condition from (iii) is that -1 < x < 1.

But your x value is 2014, which fails that condition, so you cannot use it.

 

[integral95]

Can you PM me the Paper lol

 

[mreditor16]

You used the formula from part (iii) to go from your infinite sum to a closed form.

However, the condition from (iii) is that -1 < x < 1.

But your x value is 2014, which fails that condition, so you cannot use it.

ah yes, my bad! clever carret.

thanks! repped you

EDIT = You must spread some Reputation around before giving it to Carrotsticks again. :/

 

[Carrotsticks]

It's okay because you got this question from your school teacher, who got it from an old textbook and then changed the number to 2014 (to match the year), and you don't actually know from where it comes *wink*. Any coincidence is purely coincidental.

 

[mreditor16]

It's okay because you got this question from your school teacher, who got it from an old textbook and then changed
the number to 2014 (to match the year), and you don't actually know from where it comes *wink*. Any coincidence is purely coincidental.

of course.