What does the apostrophe in f'(x) indicate?

The apostrophe in f’ (x) can also be read as “prime”, so f “prime” of x. The apostrophe just means that it is the derivative of f (x) and the number of apostrophes signify the number of derivative that you have.

How is [math] f'(x) [/math] read?

In mathematics, f (x) is usually denoted as some function of x. So f' (x) means the differentiation of the function f (x). No need to be confused. The apostrophe indicates the differentiation of the function. f' (x) is read as f dash of x.

How do you evaluate ?(x)?

f’ (x) is usually used to denote the first derivative of f (x) in calculus. If you are looking for a more comprehensive defnition of what a derivative is, it is essentially observing how a function changes over a very small period. For example, maybe f (x)=x^2. When x=1, f (x)=1, and when x=2, f (x)=4.

How many members were there in f(x) when they debuted?

f (x) (에프엑스) was a South Korean girl group that in the last part of their career consisted of 4 members: Victoria, Amber, Luna, and Krystal. f (x) debuted on September 5th, 2009 under SM Entertainment. In August 2015, Sulli officially left the group to concentrate on her acting.