Question

if (x+1/x)=3, then {3x/(x²+x+1)}=?​

Answer 1

Answer:

Case 1:

x+1x=3

x+1=3x

2x=1

x=12

Case 2:

x+1x=3

x2+1x=3

x2−3x+1=0

x=−(−3)±(−3)2−4(1)(1)√2⋅1

x=3±5√2