if x= 2+√5 , then find the value of (x+1/x)
Answers
Answered by
2
Step-by-step explanation:
x=2+
5
اور
x
2
=( 2)+
5
اور
)
2
=2
2
+(
5
اور
)
2
+2( 2 )(
5
اور
)
=4+5+5
5
اور
=9+5
5
اور
x
2
+
x
2
1
اور
=9+5
5
اور
+
9+5
5
اور
1
اور
=
9+5
5
اور
( 9+5
5
اور
)
2
+1
اور
=
9+5
5
اور
8 1+1 2 5+9 0
5
اور
+1
اور
=
9+5
5
اور
2 0 7+9 0
5
اور
اور
اور
Answered by
11
Answer:
x=2+
5
x
2
=(2+
5
)
2
=2
2
+(
5
)
2
+2(2)(
5
)
=4+5+5
5
=9+5
5
x
2
+
x
2
1
=9+5
5
+
9+5
5
1
=
9+5
5
(9+5
5
)
2
+1
=
9+5
5
81+125+90
5
+1
=
9+5
5
207+90
5
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