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Sagot :

TEAMCE

Bonjour,

Factoriser:

A = 49x² - 16

A = (7x)² - 4²

>> identité remarquable :

  • a² - b² = (a - b)(a + b)

A = (7x - 4)(7x + 4)

B = 21x - 14

B = 7*3x - 7*2

B = 7(3x - 2)

* = multiplication

Bonne journée

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