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Sagot :

Bonjour,

[tex](4x + 5)(4x - 5)[/tex]

[tex] = 4x \times 4x + 4x \times ( - 5) + 5 \times 4x + 5 \times ( - 5)[/tex]

[tex] = 16 {x}^{2} - 20x + 20x - 25[/tex]

[tex] = 16 {x}^{2} - 25[/tex]

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