what is difference between them?

Question

In python: for example similar this:

1- without another parenthesis 》( lamda x:x*2,5)

2-with another parenthesis 》(lambda x:x*2)(-3)
Or 》(lambda x,y:x*y)(num1,num2)

3- at first x or eg: X**2 》 (x lambda x:x ....and etc

Answer 1

Did that explain the difference?

Answer 2

Thanks for answering but why it sometimes used without parentheses ??(1) Or with the expression at the first (3)