Question

evaluate 30 upon under root 20 + under root 5​

Answer 1

Solution is :20.......

Answer 2

$\frac{30}{ \sqrt{20} + \sqrt{5} } \\ = \frac{30}{2 \sqrt{5} + \sqrt{5} } \\ = \frac{30}{3 \sqrt{5} } \\ = \frac{10}{ \sqrt{5} } \\ = (rationlise) \\ = \frac{10 \sqrt{5} }{5} \\ = 2 \sqrt{5}$

Therefore the answer is 2√5.