✨ Best Answer ✨
3x²-ax-2a²-9x-a+6=3x²+-(a+9)x+-(2a²+a-6)=3x²-(a+9)x-(2a-3)(a+2)=｛3x+(2a-3)}{x-(a+2)}=(3x+2a-3)(x-a-2)
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