Explications étape par étape:
a² - b² = (a + b)(a - b)
(x + 4) = a. x = b
(x + 4 + x)(x + 4 - x) =
(2x + 4)× 4 = 4(2x + 4) = 8(x + 2)
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Explications étape par étape:
a² - b² = (a + b)(a - b)
(x + 4) = a. x = b
(x + 4 + x)(x + 4 - x) =
(2x + 4)× 4 = 4(2x + 4) = 8(x + 2)