Q.17. If x = 3 – √8, find the value of x + 1/x.
Answers
Answered by
2
+
x
1
=?
⇒(
x
+
x
1
)
2
=x+
x
1
+2
x
(
x
1
)
=5+2
6
+
5+2
6
1
+2
=5+2
6
+
5+2
6
1
×
5−2
6
5−2
6
+2
=7+2
6
+
5
2
−(2
6
)
2
5−2
6
=7+2
6
+
25−24
5−2
6
=7+2
6
+5−2
6
=12
∴
x
+
x
1
=
12
=2
3
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