Explications étape par étape:
identité remarquable a² - b² = (a+b)(a-b)
E = (x + 4)² - 8²
E = (x + 4 + 8)(8 + 4 - 8)
E = (x + 12)(x - 4)
F = (3 - 2x)² - 2²
F = (3 - 2x + 2)(3 - 2x - 2)
F = (5 - 2x)(1 - 2x)
G = 11² - (x - 7)²
G = (11 + x - 7)(11 - x + 7)
G = (4 + x)(18 - x)
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Explications étape par étape:
identité remarquable a² - b² = (a+b)(a-b)
E = (x + 4)² - 8²
E = (x + 4 + 8)(8 + 4 - 8)
E = (x + 12)(x - 4)
F = (3 - 2x)² - 2²
F = (3 - 2x + 2)(3 - 2x - 2)
F = (5 - 2x)(1 - 2x)
G = 11² - (x - 7)²
G = (11 + x - 7)(11 - x + 7)
G = (4 + x)(18 - x)