i need help with this problem

2�ã20x + 3�ã5x

I do not understand your symbol but suspect it is square root sign

If so then

2 sqrt (20 x) + 3 sqrt (5x)

2 sqrt (4*5 x) + 3 sqrt (5x)

4 sqrt (5 x) + 3 sqrt (5x)

7 sqrt (5 x)