bonjour
je suppose que ( a - 6) est au ²
( a + 1)² - ( a - 6)² = ( a + 1 + a - 6 ) ( a + 1 - a + 6 )
= 7 ( 2 a - 5 )
( - 2 x + 9)² - 9
= ( - 2 x + 9 - 3 ) ( - 2 x + 9 + 3)
= ( - 2 x + 6 ) ( - 2 x + 12 )
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bonjour
je suppose que ( a - 6) est au ²
( a + 1)² - ( a - 6)² = ( a + 1 + a - 6 ) ( a + 1 - a + 6 )
= 7 ( 2 a - 5 )
( - 2 x + 9)² - 9
= ( - 2 x + 9 - 3 ) ( - 2 x + 9 + 3)
= ( - 2 x + 6 ) ( - 2 x + 12 )