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Sagot :

Bonjour

Développer :

A= (3x-4)(7-2x)

A = 21x - 6x² - 28 + 8x

A = - 6x² + 29x - 28

B= (5x-1)(-2x-9)-6x(3x-8)

B = - 10x² - 45x + 2x + 9 - 18x² + 48x

B = - 10x² - 18x² - 45x + 48x + 2x + 9

B = - 28x²+ 5x + 9.

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