Question

分解下列因式：

    （1）.              （2）.

Answer 1

.(1)解:原式=(x－y)²＋2(x－y)                       

=(x－y)[(x－y)＋2]                       

=(x－y)(x－y＋2).                        

(2)解:原式=[a＋4(a－b)][a－4(a－b)]                

           =(5a－4b)(－3a＋4b)                     

           =(5a－4b)(4b－3a).