now factor it ...
Tried posting this elsewhere but running out of time
2x^3 + x^2 - 2x - 1
(2x^3 + x^2) + (2x + 1)
x^2( 2x + 1) + 1(2x + 1) found the common factor(not sure if thats the right term)
So my final answer would be this which is wrong, anyone got a solution?
(2x + 1)(x^2 +1)
You have the right idea. However, when you get to this point:
(2x^3 + x^2) + (-2x -1)
you need to factor out a (-1) from the right hand terms. Then you will get:
x^2(2x + 1) -(2x + 1)
Therefore your answer is:
(x^2 - 1)(2x + 1)
which can also be written as:
(x + 1)(x - 1)(2x + 1). So (A) would be your answer.