Question

Simplify-
1)✓45-3✓20+4✓5
2)^4✓28÷^3✓7​​

Answer 1

Step-by-step explanation:

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

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

$= \sqrt{5}$

2> Question not clear...

Answer 2

Step-by-step explanation:

$\bf \underline{Solution-}$

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

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

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

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

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