Question

After simplifying √45 - 3√80 + 7√5 , we get

Answer 1

$\sqrt{45}-3 \sqrt{80} +7\sqrt{5}$

$= \sqrt{9 \times 5} - 3 \sqrt{4 \times 20} +7 \sqrt{5}$

$= 3\sqrt{5} - 4 \sqrt{5} +7 \sqrt{5}$

$= 6\sqrt{5}$