If
2 +
1
2 = 7, find the value of x-
1
Answers
Answered by
0
Answer:
2+12=7
where is x here??
Answered by
6
Answer:
Ifx
2
+1/x
2
−7 find the valve of x
3
+1/3
3
Given equation is x
2
+1/x
2
=7
we know that(x+1/x)
2
=x
2
+2.x.1/x+(1/x)
2
=x
2
+2+1/x
2
=(x
2
+1/x
2
)+2
=7+2
=9.
∴(x+1/x)
2
=9
⇒(x+1/x)=
(3)
x
⇒(x+1/x)=3.
Now ,
(x
3
+1/x)
3
=(x+1/x)
3
−3.x.1/x.(x+1/x)
=(x+1/x)
3
−3(x+1/x)
=(3)
3
−3(3)
=27−9
=18.
∴x
3
+1/x
3
=18.
Step-by-step explanation:
Hi....
Hope it helps you..
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