Question

simplify root45 -3 root20+ 4 root5​

Answer 1

Solution:-

$\sqrt{45} - 3\sqrt{20} + 4\sqrt{5} \\\\\implies 3\sqrt{5} -6\sqrt{5} +4\sqrt{5} \\\\\implies 7\sqrt{5} - 6\sqrt{5} \\\\\implies \sqrt{5}\:(Answer)$