Bonjour,
1)
-1
-1+2 = 1
1*-1 = -1
-1+1 = 0
2)
-6
-6+2 = -4
-4* -6 = 24
24 +1 = 25
3)
x
x+2
x(x+2) = x²+2x
x²+2x+ 1 = x+2x+1
