Question

How do you factor by grouping `x^3 + (2)x^2 + (4)x + 8`?

Answer 1

In this way:

`x^3+2x^2+4x+8=x^2(x+2)+4(x+2)=(x+2)(x^2+4)`

and we can not proceed further because the factor `x^2+4` can't be factored in `RR`.