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Sagot :

12x²-19x-21

12(x² - 19x/12 - 21/12)

 

x² - 19x/12 - 21/12

 

(x - 19x/24)² = x² - 19x/12 + 361/576

 

12((x - 19x/24)² - 361/576 - 21/12)

= 12((x - 19x/24)² - 361/576 - 1008/576 )

= 12((x - 19x/24)²- 1369/576)

 

En espérant t'avoir aidé.

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