MCQ
The simplest rationalising factor of $\sqrt3+\sqrt5,$ is:
- A$\sqrt3-5$
- B$3-\sqrt5$
- C$\sqrt{3}-\sqrt5$
- D$\sqrt{3}+\sqrt5$
✓
Answer
- $\sqrt{3}-\sqrt5$
Solution:
Rationalising factor of any number of kind $\sqrt{\text{a}}\pm\sqrt{\text{b}}$ is $\sqrt{\text{a}}\mp\sqrt{\text{b}}$
So. for given number $\sqrt3+\sqrt5.$ Rationalising factor would be $\sqrt3-\sqrt5.$
Hence, correct option is (c).
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