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Sagot :

TOMMUS
x² + 5x + 6 = - (x - [tex] \frac{5}{2} [/tex])² + [tex] \frac{49}{4} [/tex]
x² + 5x + 6 = - (x² - 5x + 6,25) + 12,25
x² + 5x + 6 = - x² + 5x - 6,25 + 12,25
x² + 5x + 6 = - x² + 5x + 6
x² + x² + 5x - 5x = 6 - 6
2x² = 0
x = 0.

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