Question

pls explain the full sum ..​

Answer 1

0

Step-by-step explanation:

x = (5 - √21)/2 ,1/x = 2/(5 - √21)

x + 1/x = 5

(x^2 + 1/x^2) = 25- 2 = 23

(x^3 + 1/x^3) = (5)^3 - 3(5) = 110

So on putting these values in above eq. ,we have

110 - 5(23) + 5 = 115 - 115 = 0