Factorise (x + 1) (2x^2 -x -1)?

Hi,

(x + 1) (2x² - x -1) =

(x + 1) (2x + 1)(x -1) <==ANSWER

I hope that helps!! :-)

(x + 1)(2x^2 - x - 1)
= (x + 1)(2x^2 + x - 2x - 1)
= (x + 1)[(2x^2 + x) - (2x + 1)]
= (x + 1)[x(2x + 1) - 1(2x + 1)]
= (x + 1)(2x + 1)(x - 1)

( x + 1 ) ( 2x + 1 ) ( x - 1 )

(x + 1)(2x + 1)(x - 1)

x+1 (2x+1)(x-1)

2x^3-x^2-x+2x^2-x-1

2x^3+x^2-2x-1

(x + 1) (2x^2 -x -1)
=(x+1)(2x+1)(x-1) answer//

(x + 1)(2x + 1)(x - 1)