Réponses

Meilleure réponse !
2013-05-09T17:03:30+02:00

10(2x² + 29x + 60) = 20(x² + 29/2x + 30) = 20(x² + 29/2x + 841/16 -361/16)

=20((x² + 29/2x + 841/16) -361/16) = 20((x + 29/4)² - 361/16)

= 20(x + 29/4 - 19/4)(x + 29/4 + 19/4) = 20(x + 5/2)(x + 12)