2(x+30-(x方+3x)分解因式
问题描述：
2(x+30-(x方+3x)分解因式
2(x+3)-(x方+3x)分解因式改下
答
2(x+3)-(x方+3x)
=-x²-x+6
=-(x²+x-6)
=-(x+3)(x-2)