(a)[2]
Expand and simplify $(x + 7)(x - 3)$.
(b(i))[2]
Factorise completely $15p^2q^2 - 25q^3$.
(b(ii))[2]
Factorise completely $4fg + 6gh + 10fk + 15hk$.
(b(iii))[2]
Factorise completely $81k^2 - m^2$.
(c)[4]
Solve the equation $3(x - 4) + \frac{x + 2}{5} = 6$.