Math CentralQuandaries & Queries


Question from Shifali:

if the binomial expansion of (m-nx)^3 is 1+9x+-- find the values of m & n

Hi Shifali,

I think the statement "the binomial expansion of $(m-nx)^3$ is $1+9x+--$" means that the constant in the binomial expansion is 1 and the coefficient of the x=term is 9. Do you know the binomial theorem? If so apply it to $(m - nx)^{3},$ and set the constant term to 1. What value does this give for $m?$ Now consider the x-term.

I hope this helps,

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