问题
计算题
将下列各式因式分解:
(1)(x2+4)2﹣16x2
(2)(x2﹣5)2+8(x2﹣5)+16.
答案
解:(1)(x2+4)2﹣16x2,
=(x2+4﹣4x)(x2+4+4x),
=(x+2)2(x﹣2)2;
(2)原式=(x2﹣5)2+2×4(x2﹣5)+42,
=(x2﹣5+4)2,
=(x2﹣1)2,
=(x+1)2(x﹣1)2
将下列各式因式分解:
(1)(x2+4)2﹣16x2
(2)(x2﹣5)2+8(x2﹣5)+16.
解:(1)(x2+4)2﹣16x2,
=(x2+4﹣4x)(x2+4+4x),
=(x+2)2(x﹣2)2;
(2)原式=(x2﹣5)2+2×4(x2﹣5)+42,
=(x2﹣5+4)2,
=(x2﹣1)2,
=(x+1)2(x﹣1)2