9=3²
donc 3²-(7-2x)²
(3+7-2x)(3-7+2x) de la forme a²-b²=(a+b)(a-b)
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9-(7-2x)²= (3+7-2x) (3-7+2x)=(10-2x)(-4+2x)
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9=3²
donc 3²-(7-2x)²
(3+7-2x)(3-7+2x) de la forme a²-b²=(a+b)(a-b)