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Sophiiee
@Sophiiee
April 2019
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Bonsoir, pourriez vous m'aiser pour cet exercice silvouplait :
On pose D= (3x-7)(1-6x)-(3x-7)au carré
1: Développer et réduire D.
2: Calculer D quand x= 1/7,puis quand x=-1
Merci d'avance :)
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On pose D= (3x-7)(1-6x)-(3x-7)²
1: Développer et réduire D.
D=3x-7-18x²+42x-(9x²-42x+49)
=-27x²+87x-56
2: Calculer D
quand x= 1/7
D=-27*(1/7)²+87*(1/7)-56=
-2162/49
quand x=-1
D=-27*(-1)²+87*(-1)-56=
-170
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1: Développer et réduire D.
D=3x-7-18x²+42x-(9x²-42x+49)
=-27x²+87x-56
2: Calculer D
quand x= 1/7
D=-27*(1/7)²+87*(1/7)-56=-2162/49
quand x=-1
D=-27*(-1)²+87*(-1)-56=-170