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Sagot :

AYUDA

bjr

application de (a+b) (a-b) = a² - b²

A = (x+2) (x-2)

donc a = x

et b = 2

=> A = x² - 2² = x² - 4

B = (x+3) (x-3) = x² - 3² = x² - 9

C = (3x-1) (3x+1) = (3x)² - 1² = 9x² - 1

allez - à toi

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