Question

plz someone help me to do this no.​

Answer 1

x^2 -5x +1 = 0

x^2 +1 = 5x

Dividing both sides by x:

x + 1/x = 5

Cubing both sides

x^3 + 1/x^3 + 3(x+1/x) = 125

x^3 + 1/x^3 + 3*5 = 125

x^3 + 1/x^3 = 110