Finding unknowns by comparing coefficients

Finding unknowns by comparing coefficients

Secondary 4
TGM Original Questions

The first three terms in the expansion of \((1+kx)^n\), in ascending powers of \(x\), are \(1+18x+144x^2\). Find the value of \(n\) and of \(k\).

Solution:

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Answer:\(n=9\), \(k=2\).

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