Step-by-step explanation:
[tex] {x}^{3} - {y}^{3} = (x - y) ({x}^{2} + {y}^{2} + xy)[/tex]
[tex] {k}^{3} - {4}^{3} [/tex]
[tex](k - 4)( {k}^{2} + {4}^{2} + 4k)[/tex]
[tex](k - 4)( {k}^{2} + 16 + 4k)[/tex]
Hope it helps :)
