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Sagot :

A = (-4*x-2) (7-9*x²)

si x = -3

alors A = (-4*(-3) - 2) (7 - 9*(-3)²)

           = (12-2) (7-81)

            = 10 * (-74) = -740

pareil si x = 1/3

C = -6/7 + 2/3x4

  = -6/7 + 8/3 = -18/21+56/21 = 38/21

et

-12-6x-12x+4=-5

-18x=3

x=-1/6

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