Question

simplify the following expression √45-3√20+4√5​

Answer 1

$\sqrt{45} - 3 \sqrt{20} + 4 \sqrt{5}$

$\sqrt{3 \times 3 \times 5} - 3 \sqrt{2 \times 2 \times 5} + 4 \sqrt{5}$

$3 \sqrt{5} - 3 \times 2 \sqrt{5} + 4 \sqrt{5}$

$7 \sqrt{5} - 6 \sqrt{5}$

$\sqrt{5}$

$\sqrt{5} = 2.236$