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Sagot :

Bonsoir,

A = (2x-6)(x+2)+5(x+2) = (x+2)(2x-6+5) = (x+2)(2x-1)

si x=3 alors A = (3+2)(2(3)-1) = 5 × 5 = 25

A = 0 ⇒ (x+2)(2x-1) = 0

         ⇒ x+2=0 ou 2x-1=0

         ⇒ x=-2 ou 2x=1

         ⇒ x=-2 ou x=1/2

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