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Sagot :

Bonjour,

A = 16x(1 + 2x)

A = 16x * 1 + 16x * 2x

A = 16x + 32x²

A = 32x² + 16x

B = -10(x - 19)

B = -10 * x - 10 * (-19)

B = -10x + 190

C = 4x(5 - 6x)

C = 4x * 5 + 4x * (-6x)

C = 20x - 24x²

C = -24x² + 20x

* : signe multiplier.

x : variable x.

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