bonjour,
f (x) = 4 x + 3
f ( 3) = 3 *4 + 3 = 15
f ( - 6) = - 6 *4 + 3 = - 21
f (13) = 13 * 4 + 3 = 55
4 x + 3 = 23
4 x = 20
x = 5
4 x + 3 = - 21
4 x = - 21 - 3
4 x = - 24
x = - 6
4 x+ 3 = - 1
4 x = - 1 - 3
4 x = - 4
x = - 1
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bonjour,
f (x) = 4 x + 3
f ( 3) = 3 *4 + 3 = 15
f ( - 6) = - 6 *4 + 3 = - 21
f (13) = 13 * 4 + 3 = 55
4 x + 3 = 23
4 x = 20
x = 5
4 x + 3 = - 21
4 x = - 21 - 3
4 x = - 24
x = - 6
4 x+ 3 = - 1
4 x = - 1 - 3
4 x = - 4
x = - 1