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Meilleure réponse !
  • Utilisateur Brainly
2012-05-01T21:34:23+02:00

1)D=-6x^2+10x +3x^2-5x-35=-3x^2+5x-35

2) si x=3/5=0,6

-3x^2+5x-35=-3(0,6)^2+5*(0,6)-35=-1,08+5-35=-31,08

2012-05-01T21:44:46+02:00

1)D=(-6x²+10x)+(3x²-5x+21x-35)

  D =(-6x²+10x)+(3x²+16x-35)

   D=-6x²+10x+3x²+16x-35

     =-3x²+26x-35

2) d=-3*(4/5)²+26*(4/5)-35

      =-3(16/25)+(104/25)-35

      =-48/25+(104/25) -35

       =56/25-(875/25)

       =789/25

       =31,56