bonjour
x
x + 3
2 ( x + 3) = 2 x + 6
f(x) = 2 x + 6
f ( - 2 ) = - 4 + 6 = 2
f ( - 1) = - 2 + 6 = 4
f (0) = 6
f (3) = 6 + 6 = 12
f( 5) = 10 + 6 = 16
2 x + 6 = 14
2 x = 14 - 6
2 x = 8
x = 4
donc f(4) = 14
2 x + 6 = 6
2 x = 6 - 6
2 x = 0 donc x = 0
x ( 0) = 6
2 x + 6 = - 4
2 x = - 4 - 6
2 x = - 10
x = - 5
f ( - 5) = - 4