Question
The simplest rationalising factor of $2\sqrt5-\sqrt3,$ is:
✓
Answer
- $2\sqrt5+\sqrt3$
Solution:
Rationalising factor of any number of kind $\text{a}\sqrt{\text{a}}\pm\sqrt{\text{b}}$ is $\sqrt{\text{a}}\mp\sqrt{\text{b}}$
So. for given number $2\sqrt5-\sqrt3.$ Rationalising factor would be $2\sqrt5+\sqrt3.$
Hence, correct option is (b).
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