if x2+1/x 2=79 find the value of x3+1/x3
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Answer:
x
2
+
x
2
1
=79
(x+
x
1
)
2
=x
2
+
x
2
1
+2
(x+
x
1
)
2
=79+2
(x+
x
1
)
2
=81
x+
x
1
=9
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