Question 592585
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*[tex \LARGE f] is a function.  *[tex \LARGE f(x)] is the value of function *[tex \LARGE f] at *[tex \LARGE x] and those two values represent the coordinates of the ordered pair *[tex \LARGE \left(x,f(x)\right)].


Likewise, *[tex \LARGE f(a)] is the value of the function *[tex \LARGE f] at *[tex \LARGE a] and *[tex \LARGE f\left(\sqrt{\varphi}\right)] is the value of the function *[tex \LARGE f] at *[tex \LARGE \sqrt{\varphi}].


So what do you suppose *[tex \LARGE f(2)] means?  Yep.  Just plug in a 2 for *[tex \LARGE x] and do the arithmetic.  The ordered pair is then *[tex \LARGE (2, f(2))] with the appropriate value for *[tex \LARGE f(2)] of course.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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