设多项式3a³-9a²+ka-12有因式a-3用待定系数法因式分解

设多项式3a³-9a²+ka-12有因式a-3用待定系数法因式分解
设多项式3a³-9a²+ka-12有因式a-3用待定系数法因式分解

设多项式3a³-9a²+ka-12有因式a-3用待定系数法因式分解
3(a-3)(a-b)(a-c)=3a³-9a²+ka-12或
(a-3)(3a-b)(a-c)=3a³-9a²+ka-12或
(a-3)(a-b)(3a-c)=3a³-9a²+ka-12
k=4