By using standard formulae, expand the following:

$\Big(2x + \dfrac{3}{x} - 1\Big)^2$

By using standard formulae, expand the following:

$\Big(\dfrac{2}{3}x - \dfrac{3}{2x} - 1\Big)^2$

By using standard formulae, expand the following:

(2a+b)³

By using standard formulae, expand the following:

$\Big(3x + \dfrac{1}{x}\Big)^3$