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Sagot :

Bonjour,

B = (3x - 4)(5 - 7x)

B = 3x × 5 + 3x × (-7x) - 4 × 5 - 4 × (-7x)

B = 15x - 21x² - 20 + 28x

B = -21x² + 43x - 20

Bonjour

B=(3x-4)(5-7x)

B = 3x * 5 + 3x * - 7x - 4 * 5 - 4 * - 7x

B = 15x - 21x² - 20 + 28x

B = - 21x² + 43x - 20.

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