Question

my answer is coming root 5 ...is it correct???plzz help

Answer 1

√45 - 3√20 + 4√5

=3√5 - 6√5 + 4√5

=√5

Its correct.

Answer 2

Ans.
$\sqrt{45} - 3 \sqrt{20} + 4 \sqrt{5}$
$\sqrt{9 \times 5} - 3 \sqrt{4 \times 5 } + 4 \sqrt{5}$
$3 \sqrt{5} - 3 \times 2 \sqrt{5} + 4 \sqrt{5}$
$3 \sqrt{5} - 6 \sqrt{5} + 4 \sqrt{5}$
$3 \sqrt{5 } - 2 \sqrt{5}$

$\sqrt{5}$