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Sagot :

BARTHYANASTRO007

Salut !!

Factorisons :

On sait que :

a²-b² = (a - b)(a + b)

Alors :

x²-16 = (x - 4)(x+4)

x²-81 = (x - 9)(x + 9)

x²-49 = (x - 7)(x + 7)

NEMY24

Salut!!

Explications étape par étape:

Factorisons:

a²-b²=(a-b)(a+b)

x²-16=(x-4)(x+4)

x²-81=(x-9)(x+9)

x²-49=(x-7)(x+7)

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