대수식 x3+(2a+1) x2+(a2+2a-1) x+(a2-1)를 인식으로 분해해 _.

대수식 x3+(2a+1) x2+(a2+2a-1) x+(a2-1)를 인식으로 분해해 _.

xg+(2인+1)x2+(사람2+2인-1)x+(사람2-1)=xg+(2인+1)x2+(인2+2명)x-x+(사람2-1)=(xg-x)+[(2인+1)x2+(사람2+2인)x+(사람2-1)]=x(x2-1)+[(2인+1)x+인2-1](x+1)=x(x+1)=x(x+1)+[(2인+1)x+인2-1(x+1)=(x+1)=(x+1)[x(x-1)+(2인+1)x+사람2-1]=(x+1)[x2-x+2인x+x+사람2-1]=(x+1)(x2+2인x+인2-1)=(x+1)[(x+사람)2-1]=(x+1)(x+사람+1)(x+사람-1)