Réponses

2014-09-06T19:28:30+02:00
Bonjour
f(x) = 4 - (x+1)²
f(x) = 4 - x² - 2x - 1 
f(x) = -x² - 2x + 3 
mais aussi 
f(x) = 2² - (x+1)²
f(x) = (2-x-1)(2+x+1)
f(x) = (1-x)(3+x)