Ask
your own question, for FREE!

Mathematics
81 Online

OpenStudy (asadkarim7):

If the first three terms of the expansion of (1+ax)^n in ascending powers of x are 1-4x+7x^2, Find n and a. If the first three terms of the expansion of (1+ax)^n in ascending powers of x are 1-4x+7x^2, Find n and a. @Mathematics

Still Need Help?

Join the QuestionCove community and study together with friends!

OpenStudy (asadkarim7):

Please Helppp !!

OpenStudy (anonymous):

By the binomial expansion, (1+ax)^n = 1+(nC1)ax+(nC2)(ax)^2...

OpenStudy (anonymous):

nC1 = n, nC2 = n(n-1)/2

OpenStudy (anonymous):

Plugging in the values from the question, na = -4 and a^2(n^2-n)/2 = 7

OpenStudy (asadkarim7):

HEy Moorsy Got it !! Thanks 4 ur help :)

Still Need Help?

Join the QuestionCove community and study together with friends!

OpenStudy (asadkarim7):

1 more question why u did n(n-1) /2 . why did u divide the whole tern with 2 ??

OpenStudy (asadkarim7):

term *

Can't find your answer?
Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!

Join our real-time social learning platform and learn together with your friends!

Latest Questions

5ive:
First time ever writing a song how did i do? I look up at the sky when i get bore

5 hours ago
13 Replies
4 Medals

watchyojetcuz1:
A car salesman sells cars with prices ranging from $5,000 to $45,000. The histogram shows the distribution of the numbers of cars he expects to sell over th

13 hours ago
2 Replies
1 Medal

watchyojetcuz1:
Select the correct answer. Histogram showing frequency (on scale of 0 to 5) plotted against vacation days taken last year (on scale of 0 to 30 with incremen

19 hours ago
0 Replies
0 Medals

5ive:
I really would like you to tell me why the Polaroids cannot control the certain entity of urus in spectral nps-002-8.

16 hours ago
4 Replies
0 Medals

kekeman:
The table identifies how many thousands of units of corn and diamonds the United States and Congo can produce in one week.

21 hours ago
3 Replies
0 Medals

Tbone:
Here's another beat I was going for more EDM type beat so ik most of y'all don't

3 hours ago
24 Replies
8 Medals