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Sagot :

CO0309

Réponse:

1)

[tex](2x - 3)(5x + 9) \\ = 2x \times 5x + 2x \times 9 - 3 \times 5x - 3 \times 9 \\ = 10 {x}^{2} + 18x - 15x - 27 \\ = 10 {x}^{2} + 3x - 27[/tex]

2)

[tex](8x + 2)2 \\ = 2 \times 8x + 2 \times 2 \\ = 16x + 4[/tex]

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