If 5x - (5/x) = 15, then what is the value of x3 - (1/x)3?

প্রশ্ন: If 5x - (5/x) = 15, then what is the value of x3 - (1/x)3? সমাধান:দেওয়া আছে,5x - 5/x = 15⇒ (5x - 5/x)/5 = 15/5∴ x - 1/x = 3এখন,x3 - (1/x)3= (x - 1/x)3 + 3 . x . (1/x)(x - 1/x)= (x - 1/x)3 + 3(x - 1/x)= 33 + 3 × 3= 27 + 9= 36