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Réponse :

Explications étape par étape

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Recopier et compléter :

* | .......... | .........

... | 12x^2 | -24x

... | ........... | -40

12x^2 = 12x * x

-24x = 12x * -2

-40 = -2 * 20

20 * x = 20x

* | .....x......| ...(-2)

12x | 12x^2 | -24x

20 | 20x.... | -40

12x^2 = 6x * 2x

-24x = 6x * (-4)

-40 = -4 * 10

10 * 2x = 20x

* | .....2x.. | ..(-4)

6x | 12x^2 | -24x

10 | ....20x | -40

12x^2 = 3x * 4x

-24x = 3x * -8

-40 = -8 * 5

5 * 4x = 20x

* | ...4x.... | ...-8....

3x | 12x^2 | -24x

5 | ...20x.. | -40

12x^2 = 4x * 3x

-24x = 4x * (-6)

-40 = (-6) * 20/3

20/3 * 3x = 20x

* | ....3x.... | ..(-6).....

4x | 12x^2... | -24x

20/3 | ...20x..... | -40

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