Réponses

2014-10-16T20:01:37+02:00
F( 2x-1)(5+3x)-(4-x)(2x-1)1)
F=2x*5+2x*3x-1*5-1*3x-(4*2x+4*(-1)-x*2x-x*(-1))
  =10x+6x²-5-3x-(8x-4-2x²+x)
  =10x+6x²-5-3x-8x+4+2x²-x
  =8x²-2x-1

2) x=0.1
A=8*0.1²-2*0.1-1
  =0.08-0.2-1
  =-1.12

x=-2
A=8*(-2)²-2*(-2)-1
  =32+4-1
  =35

voilà :)