Bonjour,
Je doit factoriser ces calcules pour demain, j'ai (assez) compris la factorisation mais je suis vraiment bloqué :
a) (2x+3)² - 49
b)(2x+x)² - (4x+5)²
c) 25-(3x-1)
d)(4x+1)²-(7-2x)² 
merci
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