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Exponents & Radicals
hard
0:00.0
If
x
1
/
2
+
x
−
1
/
2
=
3
x^{1/2} + x^{-1/2} = 3
x
1/2
+
x
−
1/2
=
3
, what is
x
+
x
−
1
x + x^{-1}
x
+
x
−
1
?
A
9
9
9
B
8
8
8
C
7
7
7
D
11
11
11
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