Factorise the expression (2x + 3y) cube
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By using the identity
{ (a - b)³ = a³ - b³ - 3a²b + 3ab²}
==> (2x - 3y)³ = (2x)³ - (3y)³ - 3(2x)²(3y) + 3(2x)(3y)²
==> 8x³ - 27y³ - 36x²y + 54xy²
==> 8x³ - 9y( 3y² - 4x² + 6xy)
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