Question

What is the formal way of asking how are you in Spanish?​

Answer 1

Answer: ¿Cómo está usted?

Step-by-step explanation:

Answer 2

For this case we know that the greeting is a sample of elementary courtesy in human society.

Normally the difference between a formal and informal greeting is the same difference when you have to use " tú " or "usted".

Informal way in Spanish:

¿Cómo estás (tú)?

Formal way in Spanish:

¿Cómo está Usted?

Answer:

¿Cómo está Usted?