bonsoir,
f (x) = 2 x - 7
f ( -4 ) = 2 ( - 4) - 7 = - 8 - 7 = - 15
f ( - 3 ) = 2 ( -3) - 7 = - 6 - 7 = - 13
2 x - 7 = - 9
2 x = - 9 + 7
2 x = - 2
x = - 1 donc f (-1) = - 9
f(3) = 2 *3 - 7 = 6 - 7 = - 1
2 x - 7 = 1
2 x = 1 + 7
2 x = 8
x = 4
donc f ( 4) = 1