bonjour
( x - 1 ) ² = 9
( x - 1 )² - 9 = 0
( x - 1 - 3 ) ( x - 1 + 3 ) = 0
( x - 4 ) ( x + 2 ) = 0
x = 4 ou - 2
x² = ( 9 - x )²
x² - ( 9 - x )² = 0
( x + 9 - x ) ( x - 9 + x ) = 0
9 ( 2 x - 9 ) = 0
x = 9/2
( x - 1 )² - ( 9 - x )² = 0
( x - 1 + 9 - x ) ( x - 1 - 9 + x ) = 0
8 ( 2 x - 10 ) = 0
x = 10/2 = 5
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bonjour
( x - 1 ) ² = 9
( x - 1 )² - 9 = 0
( x - 1 - 3 ) ( x - 1 + 3 ) = 0
( x - 4 ) ( x + 2 ) = 0
x = 4 ou - 2
x² = ( 9 - x )²
x² - ( 9 - x )² = 0
( x + 9 - x ) ( x - 9 + x ) = 0
9 ( 2 x - 9 ) = 0
x = 9/2
( x - 1 )² - ( 9 - x )² = 0
( x - 1 + 9 - x ) ( x - 1 - 9 + x ) = 0
8 ( 2 x - 10 ) = 0
x = 10/2 = 5