Factorize: `1029-3x^3`

Explanation

`1029 - 3x^3`
`3(343 - x^3)`
` 3(7^3 - x^3)`
`3(7 - x){7^2 + (7 xx x) + x^2},`
using the identity
`a^3- b^3= (a + b)(a^2 + ab + b^2)`
`3(7 - x)(49 + 7x + x^2)`