Question

解几道因式分解﹙1﹚121﹙x-y﹚²－169﹙x+y﹚² ﹙2﹚x﹙n-1﹚²-2x﹙n

Answer 1

﹙1﹚121﹙x-y﹚²－169﹙x+y﹚² =[11(x-y)+13(x+y)][11(x-y)-13(x+y)]=(24x-2y)(-2x-24y)=-4(12x-y)(x+12y)﹙2﹚x﹙n-1﹚²-2x﹙n-1﹚＋x=x[(n-1)²-2(n-1)+1]=x[(n-1)-1]²=x(n-2)²﹙3...