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Linda99
@Linda99
April 2019
2
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1) développer puis réduire l'expression
C=(x+5)(2x-3)-3(4x+1)
2) calculer l'expression C pour x=1
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winner123
Verified answer
Bonsoir
c = 2 x² - 3 x + 10 x - 15 - 12 x - 3
c = 2 x² - 5 x - 18
pour x = 1
x = 2 - 5 - 18 = -21
0 votes
Thanks 1
nathalienouts
Bonsoir,
C = (x+5)(2x-3)-3(4x+1)
C = (2x²-3x+10x-15)-12x-3
C =2x²+7x-15-12x-3
C = 2x²-5x-18
pour x = 1
C = 2x1²-5x1-18
C = 2-5-18
C = -21
0 votes
Thanks 1
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Verified answer
Bonsoirc = 2 x² - 3 x + 10 x - 15 - 12 x - 3
c = 2 x² - 5 x - 18
pour x = 1
x = 2 - 5 - 18 = -21
C = (x+5)(2x-3)-3(4x+1)
C = (2x²-3x+10x-15)-12x-3
C =2x²+7x-15-12x-3
C = 2x²-5x-18
pour x = 1
C = 2x1²-5x1-18
C = 2-5-18
C = -21