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Sagot :

Bonjour

Développer :

(4x - 3) (4x - 5) - (9x + 10) (10x - 9)

= 16x² - 20x - 12x + 15 - (90x² - 81x + 100x - 90)

= 16x² - 20x - 12x + 15 - 90x² + 81x - 100x + 90

= 16x² - 90x² - 20x - 12x - 100x + 81x + 15 + 90

= - 74x² - 51x + 105

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