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secondary 3 | A Maths
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Ell
Ell

secondary 3 chevron_right A Maths chevron_right Singapore

hi i don’t know how to do this question please can someone help, thanks!

Date Posted: 4 weeks ago
Views: 10

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Eric Nicholas K
Eric Nicholas K's answer
3616 answers (Tutor Details)
1st
Method 1 is to use general formula.

Method 2, which I will not write here, is plain expansion from the first term all the way until you obtain the a^4 b^4.
Ell
Ell
4 weeks ago
Thank you! I was kind of doubting if it was term 4 or term 5. Thanks for clearing it up!
Eric Nicholas K
Eric Nicholas K
4 weeks ago
It would be the fifth term in this case. In the expansion of (something)^8, there will be a total of 9 terms (powers 0 to 8).

The middle term a^4 times b^4 will be nicely the middle of the 9-term expansion, which will be the fifth term.