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February 11th, 2019, 08:04 AM   #1
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Exclamation **Need Help for this Assignment**

Hello Sir/Madam,

I have been given this question as an assignment to complete and have no clue on how to complete this question at all. Please try help as it's due in tomorrow so much help as possible will be greatly appreciated.

I have attached the assignment question with this post.

Good luck and best regards,
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File Type: jpg Math problem Q.9 (2).jpg (17.1 KB, 26 views)
lilshrekboye29 is offline  
February 11th, 2019, 10:59 AM   #2
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By differentiating both sides of the given equation,

$n(1 + x)^{n-1} = p_1 + 2p_2x + 3p_3x^2\,+\,......\,+\: np_nx^{n-1}$.

For $n > 1$, substituting $x = -1$ gives $0 = p_1 - 2p_2 + 3p_3\,-\,......\,+\: np_n(-1)^{n-1}$.
For $n = 1$, the above sum reduces to $p_1$, which is 1.

For part (b), differentiate a second time, then substitute $x = 1$.

If you want your work to be checked, post it here.
Thanks from topsquark and idontknow

Last edited by skipjack; February 11th, 2019 at 10:34 PM.
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February 11th, 2019, 01:01 PM   #3
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Try to set the coefficients equally.
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