Question
Résoudre les équations suivantes :
a) 4x-1=7x+3
b) (-4x+9)(7 - 3x) = 0
c) 9x²= 64
Merci
a) 4x-1=7x+3
b) (-4x+9)(7 - 3x) = 0
c) 9x²= 64
Merci
Asked by: USER8647
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110 Answers
Answer (110)
Bonjour,
a) 4x - 1 = 7x + 3
4x - 7x = 3 + 1
-3x = 4
x = -4/3
b) ( -4x + 9 ) ( 7 - 3x ) = 0
soit -4x + 9 = 0, soit 7 - 3x = 0
-4x + 9 = 0
-4x = -9
x = 9/4
7 - 3x = 0
-3x = -7
x = 7/3
c) 9x² = 64
x² = 64/9
x = √( 64/9 )
x = 8/3