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najwasag
@najwasag
January 2021
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Bonsoir pouvez vous m'aider ou bien me donner un exemple parce que je n'y arrive pas. Le 43
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MAHAM
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BONSOIR
1) a²-9=0
(a-3)(a+3)=0
a-3=0 ou a+3=0
a=3 ou a =-3
SR={-3;3}
2) a²=7
a²-7=0
(a-√7)(a+√7)=0
a-√7=0 ou a+√7=0
a=√7 ou a=-√7
SR={-√7;√7}
3) a²=-3
SR=∅ car ∀ a a²≥0 et -3 inferieur a 0
4) (4x+1)²=9
(4x+1)²-3²=0
(4x+1-3)(4x+1+3)=0
(4x-2)(4x+4)=0
4x-2=0 ou 4x+4=0
4x=2 ou 4x=-4
x=1/2 ou x=-1
SR{ -1 ; 1 }
4x²+12x=-9
4x²+12x+9=0
(2x)²+2×2×3+3²=0
( 2x+3)²=0
2x+3=0
2x=-3
x=-3/2
6) TU FAIS PAREIL QUE 2
7) a²=0
a=0
SR={0}
8) pareil comme lle 2
J ESPERE T'avoir aide
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Verified answer
BONSOIR1) a²-9=0
(a-3)(a+3)=0
a-3=0 ou a+3=0
a=3 ou a =-3
SR={-3;3}
2) a²=7
a²-7=0
(a-√7)(a+√7)=0
a-√7=0 ou a+√7=0
a=√7 ou a=-√7
SR={-√7;√7}
3) a²=-3
SR=∅ car ∀ a a²≥0 et -3 inferieur a 0
4) (4x+1)²=9
(4x+1)²-3²=0
(4x+1-3)(4x+1+3)=0
(4x-2)(4x+4)=0
4x-2=0 ou 4x+4=0
4x=2 ou 4x=-4
x=1/2 ou x=-1
SR{ -1 ; 1 }
4x²+12x=-9
4x²+12x+9=0
(2x)²+2×2×3+3²=0
( 2x+3)²=0
2x+3=0
2x=-3
x=-3/2
6) TU FAIS PAREIL QUE 2
7) a²=0
a=0
SR={0}
8) pareil comme lle 2
J ESPERE T'avoir aide