问题
解答题
因式分(1)8a-4a2+32 (2)(x2-5)2+8(5-x2)+16.
答案
(1)8a-4a2+32,
=-4(a2-2a-8),
=-4(a+2)(a-4);
(2)(x2-5)2+8(5-x2)+16,
=(x2-5-4)2,
=(x2-9)2,
=(x+3)2(x-3)2.
因式分(1)8a-4a2+32 (2)(x2-5)2+8(5-x2)+16.
(1)8a-4a2+32,
=-4(a2-2a-8),
=-4(a+2)(a-4);
(2)(x2-5)2+8(5-x2)+16,
=(x2-5-4)2,
=(x2-9)2,
=(x+3)2(x-3)2.