x +1/x =12 find x-1/x
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Answer:
x+
x
1
=12, x−
x
1
(x+
x
1
)
2
=x
2
+
x
2
1
+2
(12)
2
−2=x
2
+
x
2
1
=144−2
=142
(x−
x
1
)
2
=x
2
+
x
2
1
−2
=142−2
=140
x−
x
1
=
140
=2
35
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