问题 解答题

因式分解:

(1)x3-2x2-3x;

(2)x4-16.

答案

(1)x3-2x2-3x,

=x(x2-2x-3),

=x(x-3)(x+1);

(2)x4-16,

=(x2+4)(x2-4),

=(x2+4)(x+2)(x-2).

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