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Mathematics
Mathematics
Problem
Which of the following numbers, when multiplied by
(
11
+
7
)
(\sqrt{11}+\sqrt{7})
(
11
+
7
)
, will give a rational result? a)
11
+
5
\sqrt{11}+\sqrt{5}
11
+
5
b)
11
+
7
\sqrt{11}+\sqrt{7}
11
+
7
c)
11
−
7
\sqrt{11}-\sqrt{7}
11
−
7
d)
7
−
5
\sqrt{7}-\sqrt{5}
7
−
5
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