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Valtox
@Valtox
April 2019
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Bonjour j'ai besoin d'aide pour cet exercice, merci
On considère l'expression: A= (10 - 6x)(x - 7) - (x - 7)(4 - 2x)
1. développer, réduire et ordonner A.
2. factoriser A.
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maudmarine
Verified answer
Bonjour,
On considère l'expression: A= (10 - 6x)(x - 7) - (x - 7)(4 - 2x)
1.
développer, réduire et ordonner A.
A= (10 - 6x)(x - 7) - (x - 7)(4 - 2x)
A = 10x - 70 - 6x² + 42 - (4x - 2x² - 28 + 14x)
A = 10x - 70 - 6x² + 42 - 4x + 2x² + 28 - 14x
A = - 6x² + 2x² + 10x - 4x - 14x - 70 + 42 + 28
A = - 4x² - 8x
2.
factoriser A.
A= (10 - 6x)(x - 7) - (x - 7)(4 - 2x)
A = (x - 7) [10 - 6x) - (4 - 2x)]
A = (x - 7) (10 - 6x - 4 + 2x)
A = (x - 7) (- 4x + 6)
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Verified answer
Bonjour,On considère l'expression: A= (10 - 6x)(x - 7) - (x - 7)(4 - 2x)
1. développer, réduire et ordonner A.
A= (10 - 6x)(x - 7) - (x - 7)(4 - 2x)
A = 10x - 70 - 6x² + 42 - (4x - 2x² - 28 + 14x)
A = 10x - 70 - 6x² + 42 - 4x + 2x² + 28 - 14x
A = - 6x² + 2x² + 10x - 4x - 14x - 70 + 42 + 28
A = - 4x² - 8x
2. factoriser A.
A= (10 - 6x)(x - 7) - (x - 7)(4 - 2x)
A = (x - 7) [10 - 6x) - (4 - 2x)]
A = (x - 7) (10 - 6x - 4 + 2x)
A = (x - 7) (- 4x + 6)