the GCF is 8x
-x^6(64x^3 - 27)
(4x - 3y)(16x^2 + 12xy + 9y^2)
x5 - 1024 = (x - 4)(x4 + 4x3 + 16x2 + 64x + 256)
In case you meant 64x^3 - 27y^3, that factors to (4x - 3y)(16x^2 + 12xy + 9y^2)
64x2-80x+25 = (8x-5)(8x-5) when factored
The cube expression of 4x is (4x)^3, which simplifies to 64x^3.
(8x - 21)(8x + 21)
4. 12x^2-64x-256=4(3x^2-16x-64)
(11x + 9)(x + 5)
(8x + 5y)(64x^2 - 40xy + 25y^2)
4096