9709 P11 - Nov 2023 - Q1
955
(a) Expand \((1 + 3x)^6\) in ascending powers of \(x\) up to, and including, the term in \(x^2\).
(b) Hence find the coefficient of \(x^2\) in the expansion of \((1 - 7x + x^2)(1 + 3x)^6\).
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