If I remove the units from alpha the calculation executes without any error as soon as I insert units to alpha it starts giving an error not sure what I am doing wrong
°F is indeed a function.
You need a scaling function to convert degrees of Fahrenheit to Celcius or Kelvin.
You should provide some argument to it. For example:
The second error:
I do not understand the intent here. α is not defined above. There is a predefined constant α in Mathcad, which is a fine structure constant, but I doubt you intended to use it. Anyway it is not a function.
Third error says that variable is not defined, which is also true. It is not defined. Also not sure what was the intent.
You are most probably missing a multiplication between alpha and the subsequent opening bracket.
Or did you define alpha as a function?