bonjour
exercice 1
A = 3 x + 15 + x² - 16 x + 64
A = x² - 13 x + 79
B = 4 x² - 20 x + 25 - ( 16 x² + 8 x + 1)
B = 4 x² - 20 x + 25 - 16 x² + 8 x - 1
B = - 12 x² - 12 x + 24 = 12 ( x² - x + 2 )
exercice 2
C = ( - 3 x + 4 ) ( 3 x - 8 - 7 x - 2 )
C = ( - 3 x + 4 ) ( - 4 x - 10 )
D = tu factorises ( 8 y + 3)
E = tu factorises ( 2 x + 5 )
exercice 3
n
n²
2 n ²
2 n² - ( n ) ( n + 1)
2 n² - ( n² + n)
2 n ² - n ² - n
n ² - n = n ( n - 1 )
exercice 4
F = x² + 2 x + 1 - ( x² - 2 x + 1 )
F = x² + 2 x + 1 - x² + 2 x - 1
F = 4 x
10 001 ² - 9 999²
= ( 10 000 + 1 )² - ( 10 000 - 1 ) ² = 40 000
