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Wendy3110
@Wendy3110
May 2019
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Bonjour, pourriez vous m'aidez a cette exercice de math? (34)
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Hello !
A = (7x + 3)(x + 5)
= 7x*x + 7x*5 + 3*x + 3*5
= 7x² + 35x + 3x +15
= 7x² + 38x +15
B = (5 - 2x)(3x - 6)
= 5*3x - 5*6 - 2x*3x - 2x*(-6)
= 15x - 30 - 6x² + 12x
= -6x² + 27x - 30
C = (3x + 1)(-5x + 3)
= 3x*(-5x) + 3x*3 + 1*(-5x) + 1*3
= -15x² + 9x - 5x + 3
= -15x² + 4x + 3
.....etc.....etc....etc.....
c'est toujours la même chose : double distributivité
tu continues ?
Voici les résultats auxquels tu dois arriver :
D = 49x² - 28x + 4
E = 4x² - 30x - 16
F = -8x² + 28x - 12
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wendy3110
January 2021 | 0 Respostas
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wendy3110
January 2021 | 0 Respostas
bonjour, pourriez vous m'aidez a factoriser ces expression , cest lexercice 22
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A = (7x + 3)(x + 5)
= 7x*x + 7x*5 + 3*x + 3*5
= 7x² + 35x + 3x +15
= 7x² + 38x +15
B = (5 - 2x)(3x - 6)
= 5*3x - 5*6 - 2x*3x - 2x*(-6)
= 15x - 30 - 6x² + 12x
= -6x² + 27x - 30
C = (3x + 1)(-5x + 3)
= 3x*(-5x) + 3x*3 + 1*(-5x) + 1*3
= -15x² + 9x - 5x + 3
= -15x² + 4x + 3
.....etc.....etc....etc.....
c'est toujours la même chose : double distributivité
tu continues ?
Voici les résultats auxquels tu dois arriver :
D = 49x² - 28x + 4
E = 4x² - 30x - 16
F = -8x² + 28x - 12