Réponses

2014-01-25T18:47:59+01:00
C= (3+2)²+ (3x+2)(x-7)
=5²+3x²-21x+2x-14
=25+3x²-21x+2x-14
=3x²-19x+11

avec x=1/2
3*(1/2)²-19*1/2+11
=3*1/4-19/2+11
=3/4-38/4+11
=-35/4+44/4
=9/4