top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration

Facebook Login
Site Registration

If 2x+2/x=3, then what is the value of x^3 + 1/x^3 + 2 = ?

0 votes
73 views
If 2x+2/x=3, then what is the value of x^3 + 1/x^3 + 2 = ?
posted Jul 31, 2018 by anonymous

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

7/8


2x+2/x=3
x^3+1/x^3+2=y


2x+2/x=3==>x+1/x=3/2------- (1)
(x+1/x)^3=27/8------------------(2)
(x+1/x)^3=x^3+1/x^3+3x+3/x=(y-2)+3*(x+1/x), considering (1) & (2), we get
27/8= y-2 +3*3/2==> y=27/8-5/2=7/8
x^3+1/x^3+2=7/8

answer Jul 31, 2018 by Hanifa Mammadov
Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...