bonjour
donc question 6
Isaure
x
x + 1
x ( x + 1 ) = x² + x
x² + x + 1
5 ( x² + x + 1 )
= 5 x² + 5 x + 5
said
x
x²
x² + x
x² + x + 1
4 ( x² + x + 1 )= 4 x² + 4 x + 4
4 x² + 4 x + 4 + 1
= 4 x² + 4 x + 5
5 x² + 5 x + 5 = 4 x² + 4 x + 5
5 x² - 4 x² + 5 x - 4 x = 5 - 5
x² + x = 0
x = 0
