Réponses

2014-04-26T18:03:26+02:00
2.f(x) = -x² -2/3 x - 1/9 
f(x) =-( x +1/3)
² 

3.f(x) = 5/2 x² + 15x + 30 
f(x) = 5/2[x
²+(15*2/5 )x] +30
f(x)= 5/2( x² +6 x ) +30 
f(x)= 5/2[ ( x +3 )² - 9 ] +30
f(x) = 5/2(x+3)au carré -45/2 +30 =5/2(x+3)au carré +15/2