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1.  Factor (a + 3) (a-3)     

2.  this is not a product of sum and difference of two cubes.  Check again the given in item Number 2.
Tama naman ah.
when you say sum and difference of two cubes, the pattern is (a+b) (a-b) = a^3 - b^3. The second given item does not fall in this pattern:-) The factor of second item is (4x + 3y) (16x^2-12xy+9y^2). Notice that the factor is not (a+b) (a-b) pattern .
But if the given product is 64x^3 - 27y^3, the it satisfies the sum and difference of two cubes which is (4x+3y) (4x-3y)
*then it satisfies...