A=(x+3)²=x²+6x+9
et B=x(x+6)=x²+6x
A-B=x²+6x+9-(x²+6x)=9
donc
B=A-9
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A=(x+3)²=x²+6x+9
et B=x(x+6)=x²+6x
A-B=x²+6x+9-(x²+6x)=9
donc
B=A-9