Développer f(x)=(x+2)² -3x(x+2) et montrer que cela fait f(x)=-2x²-2x+4 Factoriser f(x)=(x+2)² -3x(x+2) et montrer que cela fait f(x)=-2(x-1)(x+2)

Merci à ceux qui m'aideront!
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