Question

How do you factor `2y^3 + y^2 - 2y -1`?

Answer 1

See Explanation
If you made a typo in your question, feel free to correct me.

Explanation:

Grouping.

`(2y^3+y^2)+(-2y-1)`
Factor out `y^2(2y+1)-1(2y+1)`
Group `(y^2-1)(2y+1)`