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April 20, 2014

Homework Help: Pre Calculus 12 urgent

Posted by Shreya on Friday, January 18, 2013 at 10:00am.

andrew is working on a binomial problem (1/2x-y)^7. He asks u to :

i) what the coefficient of the 6th term
ii) find the term that has the variabes x^47^3 (ex. 34x^4y^3)
iii) find the first three terms of the expansion

I really need help with that ^ . I know the powers of A decrease with the terms, and the powers of b increase. So I think I get like 7P3 or something I just dont know where to go from there. The answer is supposed to be 21/4 for i) -35/10x^4y^3 and for iii) 1/128x^7-1/64x^6y+1/32x^5y^2.

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