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Secondary II • 2yr.

Bonjour, Nous avons un blocage pour ce calcul de la valeur numérique pour cette expression: Si a= -2, c= -5

Comment arrive-t-on à la réponse = 86

-a + 3(a-c) + c "exposant"2 - ac"exposant 2" = 86

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Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

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    Team Alloprof • 2yr.

    Bonjour,

    si on réécrit la formule :

    -(-2) + 3(-2-(-5)) + (-5)^2 - (-2)(-5)^2 =

    appliquons PEMDAS :

    -(-2) + 3(-2-(-5)) + (-5)^2 - (-2)(-5)^2 =

    2 + 3(-2+5) + 25 - (-2)*25 =

    2 + 9 + 25 - (-50) =

    2 + 9 + 25 + 50 = 86

    Bonne journée :)

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