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Sagot :

Bonjour,

a²+2ab+b² = (a+b)² donc : x² + 8x + 16 = x² + 2(x)(4) + 4² = (x+4)²

a²-b² = (a+b)(a-b) donc : 4x² - 1 = (2x)² - 1² = (2x+1)(2x-1)

a²-2ab+b² = (a-b)² donc : 9x² - 6x + 1 = (3x)² - 2(3x)(1) + 1² = (3x-1)²

bonsoir,

a)

(x+4)²

b)

(2x-1) ( 2x+1)

c)

(3x-1) ²

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