(a)[2]
Find the first three terms in the expansion, in ascending powers of $x$, of $(2 + 3x)^4$.
(b)[2]
Find the first three terms in the expansion, in ascending powers of $x$, of $(1 - 2x)^5$.
(c)[2]
Hence find the coefficient of $x^2$ in the expansion of $(2 + 3x)^4(1 - 2x)^5$.