Sagot :
Bonjour,
A = x²-81
81 = 9²
identité remarquable
a²-b² =(a-b) (a+b)
(x-9) (x+9)
B = x²-25
25 = 5²
(x-5) (x+5)
C=9-x²
9 = 3²
(3-x) (3+x)
D=x²-12
(x-√12)( x+√12)
Bonjour,
A = x²-81
81 = 9²
identité remarquable
a²-b² =(a-b) (a+b)
(x-9) (x+9)
B = x²-25
25 = 5²
(x-5) (x+5)
C=9-x²
9 = 3²
(3-x) (3+x)
D=x²-12
(x-√12)( x+√12)