问题 解答题

分解因式:

(1)x3+x2-4x-4

(2)25xn-10xn+1+xn+2

答案

(1)x3+x2-4x-4

=x3-4x+x2-4

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

=(x2-4)(x+1)

=(x+2)(x-2)(x+1);

(2)25xn-10xn+1+xn+2

=xn(x2-10x+25)

=xn(x-5)2

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