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Sagot :

49 - (x-2)²
=7²-(x-2)²
=(7-x+2)(7+x-2)
=(-x+9)(x+5)
49 - (x-2)² est du type a²-b²=(a+b)(a-b)

49 - (x-2)²= (49+x-2)(49-x+2)=(47+x)( 51-x)

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