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carinedu22lilinoula
@carinedu22lilinoula
January 2021
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Math 4eme bonjour besoins de votre aide svp
developper et reduire (les X sont des X PAS des fois)
a) 5x(3-6x)-4x
b) (3x-2)(5-4x)-3(7x-2)
c) 5x²- 4 (3-7x)
d) 5( 4x-1)-(2x+3)(-5x-7)
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nini999
Verified answer
Bonjour :
a)
5x(3 - 6x) - 4x
15x - 30x² - 4x
15x - 4x - 30x²
11x - 30x²
b)
(3x - 2)(5 - 4x) - 3(7 - 2x)
(15x - 12x² - 10 + 8x) - (21 - 6x)
(15x + 8x - 12x² - 10) - 21 + 6x
(23x - 12x² - 10) - 21 + 6x
23x - 12x² - 10 - 21 + 6x
23x + 6x - 10x² - 10 - 21
29x - 10x² - 31
c)
5x² - 4(3 - 7x)
5x² - (12 - 28x)
5x² - 12 + 28x
d)
5(4x - 1) - (2x + 3)(-5x - 7)
(20x - 5) - (-10x² - 14x - 15x - 21)
20x - 5 - (-10x² - 29x - 21)
20x - 5 + 10x² + 29x + 21
20x + 29x - 5 + 21 + 10x²
49x + 16 + 10x²
J’espère t'avoir t'aider
2 votes
Thanks 1
carinedu22lilinoula
merci beaucoup !!
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Verified answer
Bonjour :a)
5x(3 - 6x) - 4x
15x - 30x² - 4x
15x - 4x - 30x²
11x - 30x²
b)
(3x - 2)(5 - 4x) - 3(7 - 2x)
(15x - 12x² - 10 + 8x) - (21 - 6x)
(15x + 8x - 12x² - 10) - 21 + 6x
(23x - 12x² - 10) - 21 + 6x
23x - 12x² - 10 - 21 + 6x
23x + 6x - 10x² - 10 - 21
29x - 10x² - 31
c)
5x² - 4(3 - 7x)
5x² - (12 - 28x)
5x² - 12 + 28x
d)
5(4x - 1) - (2x + 3)(-5x - 7)
(20x - 5) - (-10x² - 14x - 15x - 21)
20x - 5 - (-10x² - 29x - 21)
20x - 5 + 10x² + 29x + 21
20x + 29x - 5 + 21 + 10x²
49x + 16 + 10x²
J’espère t'avoir t'aider