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resoudre graphiquement puis algebriquement les equations: (E1): (x+1) (x-5)=0 (E2): (8x-11) (4-9x)=0 (E3): (x-3) (5x-7)+x au carre -9=0 (E4): (x+2)(4x+1) = 2(x+2)

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(E1) x = -1 ou x = 5

 

(E2) x = 11/8 ou x = 4/9

 

(E3) (x-3) (5x-7) + x² -9=0

         (x-3)(5x - 4 + x+3) = 0

                  (x-3)(6x - 1) = 0

            x= 3 ou x = 1/6

 

(E4) (x+2)(4x+1) = 2(x+2) 

   (x+2)(4x + 1 -2) = 0

           (x+2)(4x-1) = 0

       x = -2 ou x = 1/4

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