Find the first four terms, in ascending powers of x, of the binomial expansion (2 + kx)^6. Given that the coefficient of the x^3 term in the expansion is -20.
Added by Diana M.
Step 1
.. where C(n,r) is the binomial coefficient "n choose r" (i.e. the number of ways to choose r items from a set of n items), given by: C(n,r) = n! / (r!(n-r)!) Using this formula, we can calculate the first few terms of the expansion: (2+kx)^6 = 1(2^6) + Show more…
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