Question

Ravita donated Rs (x^3+ 1/x^3) to blind school. Her friends wanted to know the amount donated by her. She did not disclose the amount but gave a hint that x + 1/x = Rs 7, the amount donated by Ravita to blind school is​

Answer 1

Answer:

Rs 322

Step-by-step explanation:

x + 1/x = 7

cube on both sides,

x³ + 1/x³ + 3.x.1/x ( x + 1/x) = 343

x³ + 1/x³ + 3(7) = 343

x³ + 1/x³ = 343 - 21 = 322

so amount donated is Rs 322

Answer 2

Answer:

Step-by-step explanation: