M=x²+(5x-3)(-3x+9)-9
N=4x²-9+(5x-4(2x-3)-(4x+6)
O=36-25x²+(10x-12)(-x+3)-5x+6
Q=1-x²+(2x-2)²+(3x-3)(-x+4)
on donne
A=(3x-4)²
B=9x²-24x+15
developper A
montrer que A = B(x)+1
en déduire une factorisation de B
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