Bonjour. J'ai compris un peu mais chui pas sûr.
on considère l'expression :

c = (3x - 5)( - 5x + 2) +9x²- 30x + 25

1) developper C.
2) factoriser 9x² -30x + 25.
3)en déduire la forme factorisée de C.
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