Question

How do you factor `-r ^ { 4} + 2r ^ { 3} - 6r`?

Answer 1

`-r(r^3-2r^2+6)`

Explanation:

You have to find the thing(s) that each term has in common with the others.

In this expression, the only thing in common is `-r` or `-1` and `r`. This means that we can factor out a `-1` and `r`:

`-r(r^3-2r^2+6)`