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Sagot :

Bonjour,

A = 4x² + 3x - 2x² + 1 - 5 + 5x

A = 4x² - 2x² + 3x + 5x + 1 - 5

A = 2x² + 8x - 4

B = 3 × 2x + 4x × (-2x) - 7 × (-2) + 4 × 3 + 7x × x

B = 6x - 8x² + 14 + 12 + 7x²

B = -8x² + 7x² + 6x + 14 + 12

B = -x² + 6x + 26

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