Answers

2014-05-05T18:14:22+08:00
First problem

Factor by grouping

(x³ + 2x²) - (x - 2) 
the sign will change
(x³+2x²) - (x+2)
factor again
x²(x+2)- (x+2)

(x²-1) (x+2)

difference of two squares

(x+1)(x-1)(x+2) 

:)
0
Second problem are difference of two squares and difference of two cubes... They're already factored...