因式分解: (1)2a2bc-4ab2c+8abc2 (2)(x2-2)2-14(x2-2)+49
问题描述:
因式分解:
(1)2a2bc-4ab2c+8abc2
(2)(x2-2)2-14(x2-2)+49
答
(1)2a2bc-4ab2c+8abc2=2abc(a-2b+4c);
(2)(x2-2)2-14(x2-2)+49,
=(x2-2-7)2,
=(x2-9)2,
=(x+3)2•(x-3)2.