Factorise 3+2x-x^2 please!?

2016-07-19 5:15 pm

回答 (7)

2016-07-19 5:20 pm

3 + 2x - x²
= (3 - x) + x + 2x - x²
= (3 - x) + 3x - x²
= (3 - x) + (3x - x²)
= (3 - x) + x(3 - x)
= (1 - x)(3 - x)

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2016-07-19 5:20 pm

-(x^2 - 2*x - 3)
-(x + 1)*(x - 3)
(x + 1)*(3 - x) <<<

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2016-07-20 6:30 am

-(x-3)(x+1)

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2016-07-19 10:43 pm

(-x +1) (x+1)

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2016-07-19 5:42 pm

3 + 2x - x^2
= (3 - x)(x + 1)

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2016-07-19 5:24 pm

　
3 + 2x − x²
= −(x² − 2x − 3)
= −(x − 3) (x + 1)

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2016-07-19 5:23 pm

-1(x² - 2x - 3) = -1(x - 3)(x + 1) or (3 - x)(1 + x)

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