Problemes math :(

1) on pose H = (x-4)*2 -x(x-10)

a) developper et reduire H

b) trouver les deux valeurs de x pour lesquelles H=16

2) on pose I=(7x-3)*2-5

a) factoriser I

b) trouver les deux valeurs de x pour lesquelles I=0

(*2 = puissance 2)

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