Bonsoir,
on utilise (a-b)(a+b) pour factoriser 49-x²
car (a-b)(a+b)=a²-b²
donc 49-x² = 7²-x² = (7+x)(7-x)
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Bonsoir,
on utilise (a-b)(a+b) pour factoriser 49-x²
car (a-b)(a+b)=a²-b²
donc 49-x² = 7²-x² = (7+x)(7-x)