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x3+(2a+1)x2+(a2+2a-1)x+a2-1的解法

题目详情
x3+(2a+1)x2+(a2+2a-1)x+a2-1的解法
▼优质解答
答案和解析
是因式分解吧!X3+(2a+1)X2+(a2+2a-1)X+(a2-1)
= X3+2a X2+ X2+ a2X+2aX-X+ a2-1
= a2 (X+1)+2aX(X+1)+ X3+ X2-X-1
= a2 (X+1)+2aX(X+1)+ X2 (X+1)-(X+1)
= (X+1)( a2 + X2 +2aX -1)
=(X+1)[(a+X)2-1]
=(X+1)(a+X-1)(a+X+1)