If 2(x²+1) =5x , find : x- 1/x
Answers
Answered by
1
Answer:
12?_456+799=__285565086589539
Answered by
0
Step-by-step explanation:
2(x
2
+1)=5x
=>
x
x
2
+1
=
2
5
=>x+
x
1
=
2
5
Squaring both sides,
=>x
2
+
x
2
1
+2(x)+(
x
1
)=
4
25
=>x
2
+
x
2
1
=
4
25
−2
=>x
2
+
x
2
1
=
4
17
Now,
(x−
x
2
1
)
2
=x
2
+
x
2
1
−2(x)+(
x
1
)
=
4
17
−2
=
4
9
=>x−
x
1
=±
4
9
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