bonjour

= 2² - (x-2)²

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

= x (-x-4)

puisque a²-b² = (a+b) (a-b)

Bonjour,

4 = 2²

a² -b² = (a-b) (a+b)

(x-2)²+2²

( x-2 -2) ( x-2+2)

= (x-4 ) ( x)

= -  (x-4 ) ( x)