Question

If x = root 40, find root x + 1/root x?

Answer 1

x =√40 = √(4×10) = 2√10
1/x = 1/(2√10) =1×(√10)/[(2√10)×√10]
      =(√10)/20

∴x +1/x = 2√10 +(√10)/20
            =(41√10)/20