Question

How do you factor `8x^3 - 8x^2 - x + 1` by grouping?

Answer 1

`8x^3-8x^2-x+1`
Take `8x^2` common from first two terms and `-1` from the last two terms.
`=8x^2(x-1)-1(x-1)`
Take the factor `(x-1)` as common.
`=(x-1)(8x^2-1)`