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Romain123
@Romain123
April 2019
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DM : Equations et Factorisation ( Urgent)
a) Factoriser : 25x²-4 puis factoriser : A= 25x²-4+(2x+3)(5x+2)
b) Factoriser : x²-14x+49 puis factoriser : B= (3x-4)(x-7)+(x²-14x+49)
c) Résoudre les équations : A=0 et B=0.
Pouvez vous m'aider SVP !
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Fabrice
A)
25x² - 4 = (5x -2)(5x+2)
A = (5x+2)(5x-2+2x+3) = (5x+2)(7x+1)
b)
x²-14x+49 = (x-7)²
B = (x-7)(3x-4+x-7) = (x-7)(4x-11)
c)
pour A = 0 : x = -2/5 ou -1/7
pour B = 0 : x = 7 ou 11/4
En espérant t'avoir aidé.
2 votes
Thanks 1
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25x² - 4 = (5x -2)(5x+2)
A = (5x+2)(5x-2+2x+3) = (5x+2)(7x+1)
b)
x²-14x+49 = (x-7)²
B = (x-7)(3x-4+x-7) = (x-7)(4x-11)
c)
pour A = 0 : x = -2/5 ou -1/7
pour B = 0 : x = 7 ou 11/4
En espérant t'avoir aidé.