Bonjour, je ne comprends pas cette exercice :
Factoriser chaque expression en utilisant une identité remarquable.

a) x² +16x + 64 
b) 4x² - 20x + 25
c) 16x² -1
d) 4x² - 25
e) 9 - x²
f) (x + 2)² - 49 
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