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Sagot :

(a-b)²=a²-2ab+b²

et a²-b²=(a+b) (a-b)

A=(2x)²-2*2x*7+7² - 36x² = 4x²-28x+49-36x²= -32x²-28x+49

et

A=((2x-7)+6x) ((2x-7)-6x) = (8x-7) (-4x-7)

(36x²=(6x)²)

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