Question

(x+1/x) =√13 is so found out (x³-1/x³) =?

Answer 1

Answer:

ur que seems wrong....check signs (+, -)

Step-by-step explanation:

(x+1/x) =√13

cubing both side & using (a+b)³ identity

(x+1/x)³ = (√13)³

x³ + 1/x³ + 3 (x) (1/x) (x+1/x) = 13 √13

x³ + 1/x³ + 3 (x) (1/x) (x+1/x) = 13 √13

x³ + 1/x³ + 3 (x+1/x) = 13 √13

x³ + 1/x³ + 3 √13 = 13 √13

x³ + 1/x³ = 13 √13 - 3 √13

x³ + 1/x³ = 10 √13