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CBSE Class 9 Answered

If (x+1/x)=9,then find the value of (x^3+1/x^3)
Asked by rr5210887 | 04 Feb, 2018, 09:27: PM
answered-by-expert Expert Answer
begin mathsize 16px style straight x plus 1 over straight x equals 9
Taking space cube space on space both space sides comma
open parentheses straight x plus 1 over straight x close parentheses cubed equals 9 cubed
straight x cubed plus 1 over straight x cubed plus 3 straight x cross times 1 over straight x open parentheses straight x plus 1 over straight x close parentheses equals 729
straight x cubed plus 1 over straight x cubed plus 3 cross times 9 equals 729
straight x cubed plus 1 over straight x cubed equals 729 minus 27
straight x cubed plus 1 over straight x cubed equals 702 end style
Answered by Sneha shidid | 05 Feb, 2018, 10:03: AM
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