Question

root under 45-3 root under 20+4 root under 5 simplify

Answer 1

$\sqrt{45} - 3 \sqrt{20} + 4 \sqrt{5} \\ = \sqrt{9 \times 5} - 3 \sqrt{4 \times 5} + 4 \sqrt{5} \\ = 3 \sqrt{5} - 6 \sqrt{5} + 4 \sqrt{5} \\ = 7 \sqrt{5} - 6 \sqrt{5} \\ = \sqrt{5} \: \: \: ans$