If #x^2 + 1/x^2 = 27#. Then find #x-1/x# ?
If #x^2 + 1/x^2 = 27# . Then find #x-1/x#
If
2 Answers
Jan 27, 2018
Explanation:
just expand, rearrange n substitute,!
since we have the value of
-Sahar
Jan 27, 2018
Explanation:
#"note that "(x-1/x)^2=x^2-2+1/x^2#
#rArrx^2-2+1/x^2=27-2=25#
#rArr(x-1/x)^2=25#
#color(blue)"take the square root of both sides"#
#rArrx-1/x=+-5larrcolor(blue)"note plus or minus"#