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

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