aider moi a l'exos 94 svp

bonjour,

a²-b² on factorise (a-b)(a+b)

x²-1 =
a²  =x, b² = 1
(x-1)(x+1)

x²-16 = (x-4)(x+4)

x²-9 =(x-3)(x+3

x²-81  =à toi