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Mathematics 14 Online
OpenStudy (anonymous):

Can someone help me with binomial: Using the fact that (1+x)^4 (1+x)^9 = (1+x)^13 Show 4c0 9c4 + 4c1 9c3 + 4c2 9c2 + 4c3 9c1 + 4c4 9c0 = 13c4 I don't know how to link the coefficients of the first two and last two terms to the RHS. I tried finding the coefficient of x4 but I couldn't remember how to explain it. How do you set out your working out?

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