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Mathematics
Problem
Identify the conjugate of
4
−
7
4 - \sqrt{7}
4
−
7
. a)
−
4
+
7
-4 + \sqrt{7}
−
4
+
7
b)
−
4
−
7
-4 - \sqrt{7}
−
4
−
7
c)
4
+
7
4 + \sqrt{7}
4
+
7
d)
1
4
−
7
\displaystyle\frac{1}{4-\sqrt{7}}
4
−
7
1
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