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leptitmickeyfou
@leptitmickeyfou
January 2021
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Bonjour, je suis très fatiguée et je n'arrive pas ce petit exercice et sa m'aiderai beaucoup si vous pouviez m'aider merci d'avance,
Développer → (4x - 5)( 3x + 7)
Factoriser (2x + 8)(4x - 6) - (4x - 6)(x - 3)
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swnn
Développer:
4x*3x+4x*7-5*3x-5*7 = 12x²+28x-15x-35 = 12x²+13x-35
Factoriser:
(4x-6)*[(2x+8)-(x-3)] = (4x-6)(2x+8-x+3) = (4x-6)(x+11)
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leptitmickeyfou
Merci beaucoup mais que veut dire le petit * ?
swnn
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4x*3x+4x*7-5*3x-5*7 = 12x²+28x-15x-35 = 12x²+13x-35
Factoriser:
(4x-6)*[(2x+8)-(x-3)] = (4x-6)(2x+8-x+3) = (4x-6)(x+11)