问题
解答题
把下列多项式分解因式
(1)3x2-24x+48; (2)3a+(a+1)(a-4).
答案
(1)3x2-24x+48
=3(x2-8x+16)
=3(x-4)2;
(2)3a+(a+1)(a-4)
=3a+a2+a-4a-4
=a2-4
=(a+2)(a-2).
把下列多项式分解因式
(1)3x2-24x+48; (2)3a+(a+1)(a-4).
(1)3x2-24x+48
=3(x2-8x+16)
=3(x-4)2;
(2)3a+(a+1)(a-4)
=3a+a2+a-4a-4
=a2-4
=(a+2)(a-2).