Réponse :
bonjour
A = 3 x -21
B = - 6 x + 3 - 6 + x = - 5 x - 3
C = - 15 x² + 20 x + 18 x - 24 = 15 x² + 38 x - 24
$$$$$$$
A = ( 3 x + 4 )² = 9 x² + 24 x + 16
B = 4 x² - 20 x + 25
C = 9 x² - 36
$$$$$$$$$
A = 15 x + 10 = 5 ( 3 x + 2 )
B = 8 x ³ - 4 x² + 12 x = 4 x ( 2 x² - x + 3 )
$$$$$$$$$$
A = ( x - 7 ) ( x + 4 + 3 x - 5 ) = (x + 7 ) ( 4 x - 1 )
B = ( 2 x - 5 )²
C = ( 3 x - 8 ) ( 3 x + 8 )
D = ( 4 x + 1 - 7 ) ( 4 x + 1 + 7 ) = ( 4 x - 6 ) ( 4 x + 8 ) = 4 ( 4 x - 6 ) ( x + 2 )
$$$$$$$$$$$$
A = 2 ( 3 x + 1 ) / ( 3 x + 1 ) + 5 x / ( 3 x + 1 )
= ( 6 x + 1 + 5 x ) / ( 3 x + 1 )
= ( 11 x + 1 ) / ( 3 x + 1 )
B = { 7 x ( 3 - x ) / ( x + 2 ) ( 3 - x ) - 5 ( x + 2 ) / ( x + 2 ) ( 3 - x ) ]
= ( 21 x - 7 x² - 5 x - 10 ) / ( 3 x + 1 ) ( 3 - x )
= ( - 7 x² + 16 x - 10 ) / ( 3 x + 1 ) ( 3 - x )
$$$$$$$$$
4 x - 8 = 7 x + 4
4 x - 7 x = 4 + 8
- 3 x = 12
x = - 4
- 35 + 10 x = 9 - 6 x
10 x + 6 x = 9 + 35
16 x = 44
x = 44/16 = 2.75
( 2 x + 5 ) ( x - 4 ) = 0
x = - 5/2 ou 4
$$$$$$$$$$$$$
x² = 16
x = √16 ou - √16
x = 4 ou - 4
x² = - 7
pas de solution
$$$$$$$$$$$$$$
( 3 x + 5 ) / ( x - 1 ) = 0 avec x ≠ 1
x = - 5/3
allez termine
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