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Sagot :

Explications étape par étape:

[tex](4 + {x} )^{2} - x ^{2} \\ = {4}^{2} + 2 \times 4 \times x + {x}^{2} - x ^{2} \\ = 16 + 8x + x ^{2} - x ^{2} \\ = 16 + 8x + 0 \\ = 16 + 8x[/tex]

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