Question

Square root 45- 3 square root +4 square root 5

Answer 1

the answer of this question is 62

Answer 2

Given
$\sqrt{45} - 3 \sqrt{20} +4 \sqrt{5}$
$\sqrt{9*5} - 3 \sqrt{4*5} +4 \sqrt{5}$
$3\sqrt{5} - 3*2 \sqrt{5} +4 \sqrt{5}$
$3\sqrt{5} - 6 \sqrt{5} +4 \sqrt{5}$
$\sqrt{5}$