已知(x²+1)²-5(x²+1)-6=0,则x²+1=____, x=_____.
问题描述:
已知(x²+1)²-5(x²+1)-6=0,则x²+1=____, x=_____.
速度!谢谢!
答
答案:
则x²+1=5,x=±√5.
(x²+1)²-5(x²+1)-6=0
(x²+1-6)(x²+1+1)=0
所以:x²+1-6=0或者x²+2=0
即:x²+1=6
x²=5,
x=±√5