Bonjour j’ai besoin d’aide

Parmi les expressions suivantes, quelle est
celle qui est egale à (2x - 1)2 pour tout nombre
réel?

a) 4x^2-1
b) 2x^2-4x+1
c) 4x^2-4x+1
d) 4x^2-4x-1

Merci
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