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Which of the following should be multiplied with so that the denominator becomes rational?
MATHEMATICS · Single correct · GCSE · Mathematics · Number · Number
Problem
Which of the following should be multiplied with
1
11
+
5
\displaystyle \frac{1}{\sqrt{11}+\sqrt{5}}
11
+
5
1
so that the denominator becomes rational? (a)
11
+
5
\sqrt{11}+\sqrt{5}
11
+
5
(b)
55
\sqrt{55}
55
(c)
11
−
5
\sqrt{11}-\sqrt{5}
11
−
5
(d)
6
6
6
Related theory
Real Number System
Surds and rationalisation
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