Given : binomial expansion (2 + x)^15, coefficient of x^11 = 21840, coefficient of x^12 = 3640
Question: The coefficient of x^11 and the coefficient of x^12 in the expansion (2+kx)^15 are equal.
Find the value of the constant k
- the answer in the book is 6, which is 21840/3640, but I can't see how to get there... Any help?
Question: The coefficient of x^11 and the coefficient of x^12 in the expansion (2+kx)^15 are equal.
Find the value of the constant k
- the answer in the book is 6, which is 21840/3640, but I can't see how to get there... Any help?
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sucks at maths