Bonsoir,
Identité remarquable à connaître :
a² - b² = (a + b)(a - b)
B = (2x + 1)²-(4x-2) ²
B = (2x + 1 + (4x - 2))(2x + 1 - (4x - 2))
B = (2x + 1 + 4x - 2)(2x + 1 - 4x + 2)
B = (6x - 1)(-2x + 3)
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Bonsoir,
Identité remarquable à connaître :
a² - b² = (a + b)(a - b)
B = (2x + 1)²-(4x-2) ²
B = (2x + 1 + (4x - 2))(2x + 1 - (4x - 2))
B = (2x + 1 + 4x - 2)(2x + 1 - 4x + 2)
B = (6x - 1)(-2x + 3)