Question

If x+1/x=5 find the value of x^3+1/x^3 for 9th stamdard

Answer 1

(x + 1/x) = 5

Cube on both sides,

(x + 1/x)³ = 5³

x³ +1/x³ + 3(x×1/x)(x +1/x) =125

x³ +1/x³ + 3(1)(5)=125

x³ +1/x³ + 15 = 125

x³ +1/x³ = 125-15

x³ +1/x³ = 110



I hope this will help you


-by ABHAY