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Sagot :

Bonjour

A = (2x + 5) (3x - 1)

A = 6x² - 2x + 15x - 5

A = 6x² + 13x - 5

B = 7x² - 5 (4x - 7) - 3 (- 2x² + 5)

B = 7x² - 20x + 35 + 6x² - 15

B = 7x² + 6x² - 20x + 35 - 15

B = 13x² - 20x + 20.

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