Question

Simplify √45 + 3√20 - 4√5


please don't put random answers for points

Answer 1

Step-by-step explanation:

$\bf \underline{Solution-}$

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

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

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

$\sf{ = (3 - 6 + 4) \sqrt{5} }$

$\sf{ = \sqrt{5} } \: \: \: \: \bf{Ans.}$

Answer 2

Answer:

√5

Step-by-step explanation:

=√45-3√20+4√5

=√3×3×5 - 3√2×2×5 + 4√5

=3√5-3×2√5+4√5

=3√5-6√5+4√5

=7√5-6√5

=√5