Réponses

2012-11-11T15:29:15+01:00

f:4 --> 2*4+3 = 11

f:-5 --> 2*(-5)+3 = -7

Voila ;) 

2012-11-11T15:29:19+01:00

2x4+3 = 11       f(4)=11

2x(-5)+3 = -7    f(-5)=-7