Factorise (x + 1) (2x^2 -x -1)?
回答 (7)
2009-04-26 3:07 pm
✔ 最佳答案
Hi,(x + 1) (2x² - x -1) =
(x + 1) (2x + 1)(x -1) <==ANSWER
I hope that helps!! :-)
2009-04-26 3:46 pm
(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^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)
2009-04-26 3:34 pm
( x + 1 ) ( 2x + 1 ) ( x - 1 )
2009-04-26 3:12 pm
(x + 1)(2x + 1)(x - 1)
2009-04-26 3:12 pm
x+1 (2x+1)(x-1)
2x^3-x^2-x+2x^2-x-1
2x^3+x^2-2x-1
2x^3-x^2-x+2x^2-x-1
2x^3+x^2-2x-1
2009-04-26 3:11 pm
(x + 1) (2x^2 -x -1)
=(x+1)(2x+1)(x-1) answer//
=(x+1)(2x+1)(x-1) answer//
2009-04-26 3:06 pm
(x + 1)(2x + 1)(x - 1)
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