Bonjour,
a)
4(x+1) =4x+4
b)
4x+4 = 19
4x= 19-4
4x= 15
x= 15/4
x=3,75cm
c)
(x+1) (x+1) =
d)
x² + 2x +1
e)
3² + 2*3 + 1 =
9+6+1
=> 16 cm²
exercice 2
Pythagore:
(5x)² = (3x)² + (4x)²
25x² = 9x² + 16x²
25x² = 25x²
