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JulienZitte420
@JulienZitte420
April 2019
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Soit B = (7-3x)2 - 64
a) Factoriser b
b) Resoudre l'equation B = 0
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pan59
(7-3x)² - 64= (7-3x+8) (7-3x-8)
= (-3x +15) (-3x -1)
Solutions:
-3x+15=0 d'où x=5
-3x-1=0 d'où x=-1/3
0 votes
Thanks 2
droopette
Soit B = (7-3x)² - 64
a) Factoriser b
B = (7-3x)² - 64
=(7-3x+8)(7-3x-8)
=(15-3x)(-1-3x)
b) Resoudre l'equation B = 0
(15-3x)(-1-3x)=0
15-3x=0 ou -1-3x=0
-3x=-15 ou -3x=1
x=5 ou x=-1/3
0 votes
Thanks 1
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Lista de comentários
= (-3x +15) (-3x -1)
Solutions:
-3x+15=0 d'où x=5
-3x-1=0 d'où x=-1/3
a) Factoriser b
B = (7-3x)² - 64
=(7-3x+8)(7-3x-8)
=(15-3x)(-1-3x)
b) Resoudre l'equation B = 0
(15-3x)(-1-3x)=0
15-3x=0 ou -1-3x=0
-3x=-15 ou -3x=1
x=5 ou x=-1/3