Question 29
What is the value of a+b in the binomial expansion $(ax+by)^{10}$ if the coefficient of the 3rd term of the binomial expansion of $(ax+by)^9$ is 36 and if the coefficient of the 4th term of the binomial expansion of $(ax+by)^9$ is equal to 84?
Use real a,b and order terms by descending powers of x.
Use real a,b and order terms by descending powers of x.