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3 years ago

Bonjour, je dois faire un exercice de maths pour lundi:

Mathematics

1 answer:

Elza [17]3 years ago

4 0

Answer:

A: 8x^2 + 2x - 1

B: 5x - 2x^2 + 18

C: 34x - 6x^2 - 40

D: 70 - 28x

Step-by-step explanation:

A: (2x+1)(4x-1) = 8x^2 - 2x + 4x - 1 = 8x^2 +2x - 1

B: (2x - 9)(-x -2) = -2x^2 -4x + 9x + 18 = 5x - 2x^2 + 18

C: (3x - 5)(8 - 2x) = 24x - 6x^2 - 40 + 10x = 34x-6x^2-40

D: (10-4x) x 7 = 70-28x

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