MCQ
The simplest rationalising factor of $2\sqrt5-\sqrt3,$ is:
- A$2\sqrt5+3$
- ✓$2\sqrt5+\sqrt3$
- C$\sqrt{5}+\sqrt3$
- D$\sqrt{5}-\sqrt3$
✓
Answer
Correct option: B.
$2\sqrt5+\sqrt3$
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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