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84560
@84560
May 2019
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Bonjour, j'ai un exercice à faire (le 44) en maths mais je n'y arrive pas. Pouvez-vous m'aider s'il vous plaît merci.
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Liisou
D = (4x-1)²+(x+2)(4x-1)
=(4x-1)(4x-1)+(x+2)(4x-1)
=16x²+4x-4x+1+4x²-1x+8x-2
=20x²+7x-1
( questions 1 et 2 reuni)
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aymanemaysae
Bonjour ;
1) D = (4x - 1)² + (x + 2)(4x - 1) = 16x² - 8x + 1 + 4x² - x + 8x - 2
= 20x² - x - 1 .
2) D = (4x - 1)² + (x + 2)(4x - 1) = (4x - 1)(4x - 1 + x + 2)
= (4x - 1)(5x + 1) .
3) (4x - 1)(5x + 1) = 0
donc : 4x - 1 = 0 ou 5x + 1 = 0
donc : 4x = 1 ou 5x = - 1
donc : x = 1/4 ou x = - 1/5
donc : S = {- 1/5 ; 1/4} .
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84560
Merci beaucoup j'ai réussi grâce à toi.
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=(4x-1)(4x-1)+(x+2)(4x-1)
=16x²+4x-4x+1+4x²-1x+8x-2
=20x²+7x-1
( questions 1 et 2 reuni)
1) D = (4x - 1)² + (x + 2)(4x - 1) = 16x² - 8x + 1 + 4x² - x + 8x - 2
= 20x² - x - 1 .
2) D = (4x - 1)² + (x + 2)(4x - 1) = (4x - 1)(4x - 1 + x + 2)
= (4x - 1)(5x + 1) .
3) (4x - 1)(5x + 1) = 0
donc : 4x - 1 = 0 ou 5x + 1 = 0
donc : 4x = 1 ou 5x = - 1
donc : x = 1/4 ou x = - 1/5
donc : S = {- 1/5 ; 1/4} .