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Insoumise
@Insoumise
May 2019
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Bonjour, il y a ci-joint 2 exercices de mathématique que je n'arrive pas à faire.
Je demande donc votre aide pour au moins un exercice.
Merci d'avance et bonne journée.
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nadiab
Bonjour,
Exo 1
5)
E= 9(-x+1)(-x+1)-4(2x+7)(2x+7)
E= 9(x²-x-x+1)-4(4x²+14x+14x+49)
E= 9x²-18x+9-16x²-112x-196
E= -7x²-130x-187
6)
x=0
E(0)=-7(0)²-130(0)-187
E(0)= -187
x=-1 tu remplaces x par -1
x= -1/2
E(-1/2)= -7(-1/2)²-130(-1/2)-187
E(-1/2)= -7(1/4)+130/2-187
E(-1/2)= (-7+130*2-187*4)/4
E(-1/2)= (-7+260-748)/4
E(-1/2)= -495/4
x= √3
E(√3)= -7(√3)²-130(√3)-187
E(√3)= -7*3-130√3-187
E(√3)= -130√3-208
8)
-7x²-130x-187=0
Δ = 11 664, 2 solutions x1 et x2
x1 = (-b-√Δ)/2a = (130-108) / -14= -11/7
x2 = (-b+√Δ)/2a = (130+108)/-14 = -17
-7x²-130x-187= -187
-7x²-130x= -187+187
x(-7x-130)=0
x=0 ou -7x-130=0
x= -130/7
2 votes
Thanks 1
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Exo 1
5)
E= 9(-x+1)(-x+1)-4(2x+7)(2x+7)
E= 9(x²-x-x+1)-4(4x²+14x+14x+49)
E= 9x²-18x+9-16x²-112x-196
E= -7x²-130x-187
6)
x=0
E(0)=-7(0)²-130(0)-187
E(0)= -187
x=-1 tu remplaces x par -1
x= -1/2
E(-1/2)= -7(-1/2)²-130(-1/2)-187
E(-1/2)= -7(1/4)+130/2-187
E(-1/2)= (-7+130*2-187*4)/4
E(-1/2)= (-7+260-748)/4
E(-1/2)= -495/4
x= √3
E(√3)= -7(√3)²-130(√3)-187
E(√3)= -7*3-130√3-187
E(√3)= -130√3-208
8)
-7x²-130x-187=0
Δ = 11 664, 2 solutions x1 et x2
x1 = (-b-√Δ)/2a = (130-108) / -14= -11/7
x2 = (-b+√Δ)/2a = (130+108)/-14 = -17
-7x²-130x-187= -187
-7x²-130x= -187+187
x(-7x-130)=0
x=0 ou -7x-130=0
x= -130/7