I am having a hard time solving my problem

Question

2�ã20 + 5 �ã 80 - 7 �ã5

Can someone please help me

Answer 1

Is your �ã symbol supposed to represent the square root of what follows?

If so, use the fact that
sqrt 20 = 2 sqrt 5, and
sqrt 80 = 4 sqrt 5.

Then collect terms. All will contain a sqrt 5 factor.