bonjour
programme 1
x
3 x
3 x + 1
programme 2
x - 1
x + 2
( x - 1 ) ( x + 2 )
avec 5 , Programme 1 = 15 + 1 = 16
programme 2 = ( 5 - 1 ) ( 5 + 2 ) = 4 x 7 = 28
A (x) = 3 x + 1
B (x) = ( x - 1 ) ( x + 2 )
pour obtenir 0 avec P 1
3 x + 1 = 0
3 x = - 1
x = - 1/3
B (x) = x² + 2 x - x - 2 = x² + x - 2
B (x) - A ( x)
= x² + x - 2 - ( 3 x + 1 )
= x² + x - 2 - 3 x - 1
= x² - 2 x - 3
( x + 1 ) ( x - 3 ) = x² - 3 x + x - 3 = x² - 2 x - 3
3 x + 1 = x² + x - 2
- x² + 3 x - x = - 2 - 1
- x² + 2 x = - 3
- x² + 2 x + 3 = 0
- ( x - 3 ) ( x + 1 ) = 0
x = 3 ou - 1
quand x = 3 ou - 1 , A = B
si x = 3 , A = 9 + 1 = 10
B = 9 + 3 - 2 = 10
quand x = - 1
A = - 3 + 1 = - 2
B = - 1 + 2 - 3 = - 2
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bonjour
programme 1
x
3 x
3 x + 1
programme 2
x
x - 1
x
x + 2
( x - 1 ) ( x + 2 )
avec 5 , Programme 1 = 15 + 1 = 16
programme 2 = ( 5 - 1 ) ( 5 + 2 ) = 4 x 7 = 28
A (x) = 3 x + 1
B (x) = ( x - 1 ) ( x + 2 )
pour obtenir 0 avec P 1
3 x + 1 = 0
3 x = - 1
x = - 1/3
B (x) = x² + 2 x - x - 2 = x² + x - 2
B (x) - A ( x)
= x² + x - 2 - ( 3 x + 1 )
= x² + x - 2 - 3 x - 1
= x² - 2 x - 3
( x + 1 ) ( x - 3 ) = x² - 3 x + x - 3 = x² - 2 x - 3
3 x + 1 = x² + x - 2
- x² + 3 x - x = - 2 - 1
- x² + 2 x = - 3
- x² + 2 x + 3 = 0
- ( x - 3 ) ( x + 1 ) = 0
x = 3 ou - 1
quand x = 3 ou - 1 , A = B
si x = 3 , A = 9 + 1 = 10
B = 9 + 3 - 2 = 10
quand x = - 1
A = - 3 + 1 = - 2
B = - 1 + 2 - 3 = - 2