Question

if x+1/x=5 find the value of x3+1/x3

Answer 1

Answer:

Step-by-step explanation:

x+1/x=5

cubing both sides

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

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

x^3+1/x^3+3(5)=125

x^3+1/x^3=125-15

x^3+1/x^3=110

Answer 2

x+1/x=5

cubing both sides

(x+1/x)³=125

x³+1/x³+3(x+1/x)=125

x³+1/x³+15=125

x³+1/x³=110