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April 2019
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J'ai besoin d'aide svp :
Exercice :
1) Dévolepper et réduire les expressions suivantes.
A = ( x - 2 ) ( x + 4 ) + 3 ( x - 8 )
B = 2 ( x - 3 ) - 5 ' x - 1 ) ( x - 5 )
2) Calculer A pour x =
B pour x = -1
3) Factoriser les expressions suivantes.*
C = ( x - 2 ) ( x + 4 ) - ( x - 2 ) ( x + 8 )
D = ( x - 7 ) ( 2x + 3 ) + ( 2x + 3 ) ( x - 9 )
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shanaclaes98
(x-2)(x+4)+3(x-8)=x²+4x-2x-8+3x-24=x²+5x-32
2(x-3)-5(x-1)(x-5)=2x-6-5(x-1)(x-5)=2x-6-5(x²-5x-x+5)=2x-6-5x²+25x+5x-25=-5x²+32x-31
A=(1/4)²+5x1/4-32=1/16+5/4-32=1/16+20/16-512/16=-491/16
B= -5(-1)²+32(-1)-31=-5x1-32-31=-5-32-31=-68
factoriser : (x-2)[(x+4)-(x-8)]
(2x+3)[(x-7)+(x-9)]
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2(x-3)-5(x-1)(x-5)=2x-6-5(x-1)(x-5)=2x-6-5(x²-5x-x+5)=2x-6-5x²+25x+5x-25=-5x²+32x-31
A=(1/4)²+5x1/4-32=1/16+5/4-32=1/16+20/16-512/16=-491/16
B= -5(-1)²+32(-1)-31=-5x1-32-31=-5-32-31=-68
factoriser : (x-2)[(x+4)-(x-8)]
(2x+3)[(x-7)+(x-9)]